Well if you go to the previous page and check out the congo pics, I managed to use a flash on that and I think it came out really well. I tried no flash but it was not good. I think its because I've got very dim lighting. Its a 75 gallon with only two compact flourescent lights overhead (two 23W) and they are suspended about 18" over the tank. The light then in turn has to go through some leaves from houseplants before it hits the water. LOL Its truely a 'river' type setup. All I'm missing is murky water 
