Hey guys so I was wondering if there is any advantage to having a powerheads with cichlids? I have a green terror, salvini, and firemouth in a planted 75g. Right now the only current they have is from the emperor 400 hob on the tank. Should I add a power head for them or does it matter? If I do add one, what size powerhead should I get? Thelargest of the 3 cichlids is the salvini and he is just 1.5-2inches thanks!