Cleaning Fish Or Crab, Or Shrimp

[Raris]

Is there any fish or crab, shrimp that will help clean my aquarium for freshwater?

 

[ox5477]

well most shrimp will help eat up any left over food on the bottom.

Any crabs will need dry land to come out onto (lose tank volume to dilute wastes) or for larger inverts like crays or lobsters, can be dangerous with fish as they are oportunistic eaters and will prob harm and/or kill/eat your fish.

Ox

 

[Raris]

Well I am thinking of getting semi aggressive fish in my 55 tank. So what do you recommend then?