Dump Truck Crash Video

Everyone loves the idea of smashing fast-moving things into hard objects, but the guys who drove this dump truck into a concrete barrier really outdid themselves. I have absolutely no idea why they did it, but I’m sure glad they did. I only wish they would have loaded the thing up with boulders first.

Dump Truck Crash from Cliff Pearson on Vimeo.

Clownfish Anemone Adventure

About seven months ago, I decided to try my hand at saltwater reef keeping. I knew from the start that I wanted to get a pair of clownfish and a host anemone for them to live in as the centerpiece. Alright… So having written that, the experienced reef keeping community is now reading this and shaking its collective head because this is so typical of new saltwater hobbyists. It seems like just about everyone in the world has seen “Finding Nemo” and suddenly decided that they, too, want an aquarium with clownfish and an anemone. This is really a shame because to most of these people the clownfish are the first priority, while the host anemone is just some pretty flowing thing for them to live in. What they don’t know is that keeping clowifish is easy, but keeping host anemones is hard. Damn hard!

In fact, it has been reported that only about one out of every one-hundred host anemones in captive systems survive. Still, I’m not one to back down from a challenge, so even after doing the research and discovering that my chances for success were bleak, I decided to move forward with my plans. I set my 37 gallon tank up, mixed up a batch of salt water, and filled it up. I placed an order for 40 pounds of Marshal Island live rock, and a protein skimmer. I did some nice reefscaping with the rock, setting it right on the glass bottom of the aquarium, and fired up the protein skimmer. The next day, I picked up one bag of live sand, and two bags of Red Sea Reef Base for substrate. This resulted in the requisite 2.5 to 3 inches of substrate needed for NitrAte reduction.

At this point, there was nothing left to do but wait for the tank biology and water quality to stabilize. I watched the Ammonia spike, then the NitrIte, and finally the NitrAte. Once the NitrAte levels had fallen to 0, I placed my order for a mated pair of True Percula Clownfish (Amphiprion percula). It took several weeks for them to arrive, but when they did, I knew the they were worth the wait. $100.00 later, I was the proud owner of an amazing mated pair of Soliman Island clowns.

My research had indicated that these fish do NOT acclimate well, and I definitely found this to be true. When I brought them home, my salinity was exactly the same as that of the dealer. I used the drip method of acclimating them over the period of one hour, but it would still be several days before the fish had settled in and stopped showing signs of stress. Several weeks passed as I conducted more research on host anemones, so lacking anything more suitable, the two clowns decided to host on my powerhead.

In nature, Amphiprion percula host on the following anemones:

Heteractis crispa (Purple Long Tentacle Anemone)
Heteractis magnifica (Magnificent Anemone)
Stichodactyla gigantea (Giant Carpet Anemone)

Unfortunately, these have an especially poor tract record in aquaria, and as such, are definitely not recommended. Even the public aquariums have proven largely unable to sustain these varieties for any length of time.

ORA, the leading producer of clownfish, recommends either of the following for Amphiprion percula:

Entacmaea quadricolor (Bubble-Tip Anemone)
Stichodactyla haddoni (Haddon’s Carpet Anemone)

My first inclination was to go with Bubble-Tip Anemone, but these have a tendency to wander around the tank, stinging everything in their paths. Since I wanted to keep corals in the same tank, I didn’t want to run the risk of loosing everything to a fickle anemone that couldn’t settle on a place to call home. Therefore, I decided to go with the slightly more difficult to keep, but much more stationary Haddon’s Carpet Anemone. First, however I had to upgrade my lighting to to a 24 inch Nova strip containing four T5 bulbs. it even has the nice moonlight LED’s for nighttime viewing.

My big, green anemone showed up, and my local dealer had the incredible foresight to allow it to attach to a coffee can lid rather than the glass of their holding tank. I brought it home, and that night it moved off the lid and planted it’s foot firmly on the glass at the bottom of the tank. Many months later, it has still not moved an inch.

The next day, it was open and happy, but to my dismay, the clowns wanted nothing to do with it. They were still hosting on the powerhead, so in an effort to get them closer to what I had hoped would be their new home, I placed a large piece of PVC pipe next to the anemone. Slowly, they began to host on the PVC, but months passed, and they still wanted nothing to do with the anemone. I knew this was a risk, but it was sure a bummer to have gone to all this trouble only to have the perculas refuse their host.

In the meantime, I added a Fire Shrimp and a really nice piece of Pink Hammer Coral to the tank, and was met with general success. Everything was healthy and thriving, but the clowns stubbornly refused to adopt the anemone. I had more or less given up, when I got a call from Courtney last week while I was at work, telling me that “the clownfish had finally started hosting!!!” I could not believe my ears, and raced home after work to see. Sure enough, there they were, living happily in the anemone.

Changing Linux Mount Points

If you’re familiar with UNIX, you know that changing mount points is really pretty easy. All you have to do is go into “/etc/fstab”, “/etc/vfstab” (or whatever your flavor of UNIX happens to call its filesystem table) and change the mount directory.

If, for instance, you had a Solaris box, and you wanted to make the disk currently mounted as “/data” be mounted as “/database”, all you would have to do is the following:

# umount /data
# mv /data /database
Change this line in “/etc/vfstab” from something like this:
/dev/dsk/c1d0s6 /dev/rdsk/c1d0s6 /data ufs 1 yes -
to something like this:
/dev/dsk/c1d0s6 /dev/rdsk/c1d0s6 /database ufs 1 yes -
and remount it as “/database”.
# mount /database

With Linux, however, it’s not quite so clear anymore… It’s still easy, but it’s just not so clear what you have to do since they have now taken to mounting filesystems using the volume label. Rather than pointing directly to the disk device, Linux points to the label, and “/etc/fstab” look more like this:

LABEL=/data /data ext3 defaults 1 2

You can always simply change the disk label, but if you don’t care, you can just tell linux where the raw device is, bypassing the need to worry about the label. The easiest way to do this is simply to replace the “LABEL=/data” value to the “/dev” entry of the disk itself. Then, simply change “/data” to “/database” and you’re all set.

Here is an example of what you would do to change the mountpoint of “/data” to /database”:

# umount /data
# mv /data /database
Change this line in “/etc/fstab” from this:
LABEL=/data /data ext3 defaults 1 2
to this:
/dev/sda6 /database ext3 defaults 1 2
and remount it as /database
# mount /database

Remembering to change the example values here with those required for your situation.

Rebreather Evaluation – Part 5: My Decision

In the end, the Meg ended up winning the day. There are a lot of reasons for this. The Meg is an outstanding rebreather in just about every way, but perhaps the most compelling reason for my decision was the fact that most of the people I tech dive with regularly are using them. This is not to say that getting a unit simply because your friends are diving it is a good idea, but there is really something to be said for all members of a team using similar equipment.

After picking up my Meg and completing my training with Leon in Centrailia, WA last month, I continue to feel good about my decision. When he starts talking about the Meg, Leon sounds like a proud father, and the amount of thought and planning that has gone into every aspect of this outstanding rebreather becomes more and more evident each time I dive it. I am particularly impressed with the water traps in the “T” pieces and the drain valve in the exhalation counterlung. Assuming you aren’t doing summersaults, it seems virtually impossible for water to enter the scrubber canister.

I’ll be anxiously awaiting the Apecs 3 software which will have constant PO2 decompression software built in. Leon has established a relationship with deco guru Bill Hamilton, and word around the campfire is that the algorithm in Apecs 3 will be written by the man himself!

I’m still flying with clipped wings though because my VR3 does not do constant P02 deco. I have one of the original square VR3′s that came from OMS, and Delta P is telling me that there is no way to upgrade the code to do constant P02. That sounds a little fishy since I remember buying it with CCR constant P02 as an option. It kind of seems like someone is looking to sell another VR3. Weather I buy another VR3 or simply upgrade to Apecs 3 depends on the how much the Apecs 3 upgrade will cost. I can certainly see some benefit to having everything built into one nice package, but the redundancy you get from having a constant P02 VR3 hooked up to its own independent cell makes for some really nice fault tollerance.

I’m really quite happy with my Meg, and I’m really excited to start putting some hours on it. I thoroughly enjoyed Leon’s training program. I was able to meet some great new people, hang out with some old friends, see Ron, whom I had not seen in years, and meet a new dive buddy who lives near my home.

Rebreather Evaluation – Part 4: The Megalodon >