i far from over feed. i dont pour in any water i use to disolve the food. there is absolutley no algea in my tank, just in my fuge. directly under the light. and only under the light. it only comes when i leave the light on. i didnt remove any of the slime by myself. i turned the light off for a day or so, took a look yesterday, and its all gone. if i turn it on for a day, it will come back. it was all over the walls of the fuge but it once the lights were out, it all went away. so im convinced that it isnt lack of flow, or nutrients, but it is because of this light.