I have a 10g fry tank with mostly very small platy fry in it. There is one very small molly fry also. It is bare bottom with a few fake plants. I check the water levels daily because I had problems with this tank no too long ago. All of the levels have been perfect with the exception of a slight ammonia rise a few days ago. It went up to .25, I did a 50% water change and it went back down. It was 0 again yesterday. I want to clean the bottom of the tank but I am not sure the best way to do it. They will get sucked into the vac and I am afraid that even with something on the end of it they will still get sucked to it. Some of them were just born last weekend so they are very small. Any suggestions?