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Measurements, part 2

Posted 09/16/2018 at 10:06 AM by sacremon

Something that occurred to me at the time I was making my post was a comparison to hard drives, how a drive is advertised as being 400GB but in the computer it is shown as being 372.5GB. Thing is, the situation with aquariums and with hard drives are for completely different reasons.

Hard drive manufacturers define a gigabyte as 1 billion bytes. 1,000,000,000 or 10^9. Computers operate in powers of 2. The way the operating systems are designed, a gigabyte is a power of 2 that...
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What is it about measurements in this industry?

Posted 09/15/2018 at 01:45 PM by sacremon

I have a background as a trained lab scientist - Ph.D in Toxicology. Measurements need to be precise, but more importantly they need to be accurate.

Precise = How many digits of precision the value has, so 10.2983 is more precise than 10.4

Accurate = How close the reported value is to the actual value. If the actual value is 10.35 then 10.4 is more accurate than 10.2983

There are two places where measurements get me in this industry. One is the reported...
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Okay, so it has been a while

Posted 09/13/2018 at 09:03 AM by sacremon

I find myself with some free time and desire to start blogging again.

Lots of things have changed since that last post. The tank got upgraded to a 300DD I think later in 2011, thanks to a bonus at work. Zebra eel had a fatal run in with the fire urchin, which was painful to watch.

In early 2012 I got a Platax orbicularis (round or orbiculate batfish) along with another volitans lion. At some point Chris, the LFS guy who by that point was doing regular maintenance...
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Obstinate urchin

Posted 03/08/2011 at 02:05 PM by sacremon

I bought another urchin, which arrived today. This one is in the sump rather than the display tank, as it is too dangerous for at least the eel. It is a flower urchin, Toxopneustes pileolus. This is one of, if not the, most venomous of the sea urchins. It is reputed to have caused human deaths, and laboratory experiments with the toxin have demonstrated it to be very potent, at least in mice.

In any event, I got the urchin in today and set about acclimation. I use a bucket from...
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Naso tang gets annoyed

Posted 02/18/2011 at 12:17 PM by sacremon

A little over a week ago, I got in an Astropyga radiata. Common names are something like Radiating Urchin or Long Spine Blue Spot urchin (Live Aquaria seems to prefer the latter). They are strikingly colored, reputedly venomous and are fairly active during the day. It has been wandering all over the tank, and it appears to be at least sampling some of the algae that has taken over much of the rock and sand. Yesterday, however, it discovered the rock to which I tie nori to feed the two tangs...
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