[gnod]

is there a general rule?

how many shrimps do ya'll have in your tank?

 

[UpperPaleo]

The standard rule of thumb for fish in a tank is one inch of fish for every gallon of water. Not sure how that would translate to shrimp. I doubt a 1" shrimp would produce as much waste as a 1" fish, but I'm just guessing there.

 

[madness]

Lately I think that I have heard something along the lines of 10 adults per gallon with Neocardinas (Red Cherry Shrimp).

If you have more sensitive shrimp (high grade crystals, etc.) then you obviously wouldn't want to push the envelope.

 

[diwu13]

Generally it is 10 shrimps per gallon. However with daily water changes you can have more. At some point you'll notice the shrimps growth being stunted and that's when you should remove some.