http://forum.aqua-fish.net/ A forum devoted to aquarium fish, plants, techniques and fish keeping as a whole. en http://forum.aqua-fish.net/?topic=compatibility#1 hi all..this is the first time i am joining any forums..i have been keeping fish for approx 10-12 yrs and keep on experimenting all the time..my latest fancy is firemouth cichlid and auratus cichlids..but before all can anyone tell me how much gallon my tank is of?? its dimension is 36'' x 18''x18'' this would really help me a lot. from where i am, people are not familiar with gallon system of fish keeping. Thx in advance. el_batty 2010-07-04 http://forum.aqua-fish.net/?topic=compatibility#2 That sounds like it may be a 26 or 30 gal tank. Ange050868 2010-07-05 http://forum.aqua-fish.net/?topic=compatibility#3 A tank that size is 42 imp.gallons, 50 US gallons or 191 litres mickey 2010-07-05