So i used an under gravel filter not as a filter but as a support for rocks in my african tank instead of getting egg crate. Seemed like a good idea until the first time I gravel vacced and realized that things were surly getting trapped under the filter and could eventually cause problems. what is the solution? Should I occasionally hook it up as an under gravel filter and try and suck all the sediment out or should I just revamp before it's too late?