I have a 600ltr tank with a 8" oscar, 5" siamese tiger and a 10" clown knife, the tank is quite inactive during the day so i am wanting to add another fish, may be a cichlid of some sort any advise?
http://www.aquaticeco.com/index.cfm/fuseaction/product.detail/iid/8739/cid/2148Grinner1;644285; said:what is a power head?