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Old 07-28-2003, 07:57 PM   #1
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Livestock load? Is there a rule of thumb?

My 75G currently houses Yellow Tang 3.5 inches, Purple Tang 3.5, Humu Trigger 3, and one damsel 1.5. Steve mentioned earlier that this might be a bit crowded, while I always thought that this was a very light load on a system of this size. I realize that the Humu needs to go, but is there a formula/rule of thumb when it comes to a livestock load. What inch of fish per gallon is recognized as standard?

FYI: Pulled out a book I got when just starting over 6 years ago, "The Marine Aquarium Problem Solver", by Nick Dakin. Published in 1996, yet it seems so dated now. Have we come that far in the past 7 years? Wow.

Nothing like this hobby to make you feel like a complete idiot.
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Old 07-28-2003, 09:41 PM   #2
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Well the general rule of thumb that i think you will see printed in alot of books now a days is 1" of ADULT fish per 5 gal of tank capacity.

Now this is a general rule and does not fit every circimstance. Some fish have more of a bio load than others because they are 'messy' eaters. Other fish need swimming room and just because they fit the general rule does not mean tthey are a good fit for the tank size.

With that in mind a 75 gal tank would give you 15" of fish to work with. Now both the tangs can get up to 5-6" or larger in size as an adult so that would be 10-12" of fish. The damsel would get upward to 3" maybe 4" so thats 13-16" of fish at adult size before we figure in the trigger.

Tangs also like and need good swimming room so I would say two tangs in a 75 is probably the max for tangs in a tank that size.

Other factors to consiter when stocking the tank is the amount of biological filtration you have. Aswell as the general compatability of the existing and desired fish.

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