I have 2 adult male ACF in a 20 gallon long tank with a Tetra Whisper ex 20 filter and sand substrate. I love having the sand, but have a really difficult time cleaning my tank. Right now, I am using an eyedropper to suction out garbage at the bottom of the tank but it takes forever and I can never get the fine particles. It leaves my tank always looking messy. I was thinking about investing in a gravel vacuum, but have never used one. Would it suck up too much of my substrate? Any suggestions?