I'm looking for a canister filter for my 5.5 gallon nano tank that has crystal red shrimps. From many post I read people use the eheim 2213 which is for tanks 66gallon!!! Wouldn't the out flow of water be too strong for a 5.5 gallon? The smallest eheim filter is the 2211 and it is for 40 gallons. Even that sounds too much flow. I just want to make sure if I should buy a canister filter or not before I buy. Any suggestions?