Hello everyone and thanks in advance for any help that you can give me. I have been keeping a fowler tank now for about two years but have recently decided to begin a nano reef tank. Brief overview of new set up aqua medic chromis 140litres, 150w metal halide lighting, biostar flotar, internal 1000lph filter, external tetra tec ex(for chemical filtration). I want to use this tank as a corel and invert tank (shrimp poss starfish) though I am unsure if I can keep a tank such as this witout any fish at all. Also can anyone give me any suggestions on a clean up crew for this kind of tank. Thanks For your help