you can fit 4 in the 16 gallon and 10 in the 55 gallon, those are reccomended numbers, they will breed and when they do, just leave them, the shrimp dont matter in the inch per gallon rule. I have 5 in my 20 gallon tank.
Also let me clarify dont get the maxiumum amount, get half the maximum amount, that way they will breed and will slowly and stabaly get to the maximum. You can fit 1 shrimp per gallon, not including fish, so a fully stocked 20 gallon aquarium can hold 20 ghost shrimp at maximum, but 10 is just fine.
The quantity is really only what the tank will accomodate. I have seen 150 Cherry red shrimp in a 25 gallon and it was pristine.
As for the fish, that is a different story. The angel will love you as it will eat them if it can catch them and if the cories decide they like shrimp, they will eat them also. The sAE may also eat them once it gets a little larger.
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