I have beautiful 300 liters aquarium full with African Tropheus fish. This fish are extremely interesting. They behave like sea fish. I upload some photos of Tropheus Pemba and Ciprohromise. If anytime you try to shoot fish. O, God it's difficult. All the fish moving, the glass is like a bad lens and there are many small pieces in the water. So when you shoot aqurium you need to make: 1. Clean all the glasses and wait pump to clean for 3-4 hours 2. Stop all the equipment - filter pump, heater... and removed from the aquarium 3. Put the flashes (I use my Canon 550II on my camera and Canon430EX) on the top glas of the aquarium 4. Is very useful to put black carpet, or some black paper up front aquarium. Then make in the middle whole, where your lens will be. In this way we eliminate all reflection of us and the light from the main flash. 5. Be patient. Put high speed, f14-22 and 200ISO. I use my Canon Macro 50/f2,5 lens. Make manual focus and wait fish to move through your focus zone. Shoot it!