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Old 01-12-2006, 04:32 PM   #11
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I’d go by tank volume unless you plan on having your fish swim in your sump
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Old 01-12-2006, 05:09 PM   #12
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So amount of fish has to do with the physicxal size of the tank and not the bioload on the system?
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Old 01-12-2006, 05:24 PM   #13
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Yes and no. The “calculator” is more of a guideline. Just because you have 11” (minus tail) to play with in a 55 gal doesn’t mean you should keep a 11” fish obviously so it’s confusing to a lot people on just how many fish you can/should keep.

Say you have 90 gal to play with which does help in keeping your nh3, no2, and no3 levels down ie: “the solution to pollution is dilution” you hear so much. With such a large sump your levels may be perfect even with a lot of fish but it of course doesn’t increase the area they can swim in. Main reasons you want to avoid overstocking is two fold in that it can increase your nh3, no2, & no3 levels significantly (which you wouldn’t have to worry about as much) but also to help alleviate territorial issues.

Fish selection will play a much more important roll than quantity in your case and IMO you could get away with a few more fish than the norm assuming you choose fish that are highly compatible.
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Old 01-12-2006, 05:31 PM   #14
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In case you don't see it fishfreek said it better than I just did.

Quote:
Originally Posted by fishfreek
My definition of overstocked is very simple.

If all your pumps fail for a period of 12 or more hours will your fish sufficate due to lack of oxygen? If so your overstocked no mater how well your water conditions are when all your equipment is running.

With that said I also feel that 2-3 fish would be the max for a 20 gal tank. Given its a 20 long you can technicly get by with more fish than a 20 H because there is more surface area for gas exchange but you also must take into account the fish's agressivness as a factor when it comes to overcrowding.

I hold to the school of understocking. As an example I have a single yellow tail damsel in my 20H, a flame angel, bicolor damsel, yellow tang in my 75 and in my 80 a powder blue tang, coral beauty, hawk eye goby, and two yellow gobies. I have seen people have all those fish in a single 75 before. If your pumps work than they can live with out issues but if your pumps fail for a period of a few hours you will have deaths.
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Old 01-12-2006, 06:54 PM   #15
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Sometimes you cant go by gallons and have to go by length or depth. Tangs need plentyof swim space and length is important. A 125 is a good size for them because they are 6 ft long and have more length for swimming than a 55.. So sometimes there is more to consider than gallons only.
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Old 01-12-2006, 10:43 PM   #16
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okay, now the fish selection process is getting complicated. The quote "nothing good in this hobby happens quickly" rings true here. Alot of research take a long time.
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