... Right now I have 4 4-5 inch reds in a 75. The tank has black gravel substrate and several pieces of driftwood as cover along with a black background. I have two emp. 400's as filters. If I removed the gravel and driftwood would there be a spike in my parameters due to losing beneficial bacteria? I like the look of a bare tank and also it would be easier to clean. Suggestions are welcome.