An inch of shrimp == an inch of fish? - The Planted Tank Forum
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post #1 of 7 (permalink) Old 03-05-2004, 04:13 PM Thread Starter
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Well, that's what I'm wondering... If I have 10" of shrimp in my tank, does that equate to 10" less of fish that I can keep?
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post #2 of 7 (permalink) Old 03-06-2004, 03:47 AM
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Don't know a yes or no answer to your question but I always count my shrimp in with my fish. Shrimp do add to the bio-load of a tank but how much I don't know, I guess it depends on the size.

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post #3 of 7 (permalink) Old 03-06-2004, 04:41 AM
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They don't add much to the bioload. I believe the general rule of thumb is 1 small shrimp (red cherry, amano, etc) per gallon.

Don't quote me on that though... Personally, I keep about 1 shrimp per 3 gallons, though I am looking to purchase some more red cherries. They've all survived for a few months now, so I'm pretty confident I'm doing everything right. *shrug*

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post #4 of 7 (permalink) Old 03-06-2004, 06:22 AM Thread Starter
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What I'm really wondering is this: let's say that my tank hold 66g of water after displacement by the substrate and rocks, etc. Now:

1. If the tank by usual rules can support 66 inches of fish, but I have 10 Amano shrimp in the tank, does that mean that I should only add 56 inches of fish to go with the shrimp?


2. If shrimp do not have 1:1 bioload ratio to the fish, what is that ratio - smaller, larger?

It's just a nitpicky, curious point I'm trying to figure out. I don't expect that I am going to play with the inches per gallon threshold that closely to really make a difference.

BTW, because of the plant cover in my tank, I cannot tell whether all of my shrimp are surviving. I can count maybe 2-3 at a time. I am assuming that all the others are in there but hidden among the plants and other nooks and crannies.

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post #5 of 7 (permalink) Old 03-06-2004, 06:36 AM
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The 10 shrimp would be negligible compared to the fish.

The 1" rule isn't so great, anyway...
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post #6 of 7 (permalink) Old 03-06-2004, 07:00 AM Thread Starter
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Hi iMp - if you don't follow the 1" rule, what guides you in determining how many fish you do have in your tank?

I have read on a British website,, where they say that for the first 6 months after your tank is setup, stick to 1" per gallon, and after that you can safely push that to 2" per gallon. They don't justify this policy however...
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post #7 of 7 (permalink) Old 03-07-2004, 04:06 PM
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I don't think that shrimp have the same physiology as fish so I doubt they produce as much waste.
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