I have an Innovative Marine 16 gallon nano. It has two columns to put filtration material. In one column I have chaeto and maiden hair that acts as a refugium. In the other column I have ceramic rings and a small bag of chemipure elite. The tank is about 11 months old now. I have noticed a lot of detritus buildup in the sump area. I have started to clean the sump area when doing water changes but since it is so small I can't get most of it. Would a small cleanup crew help in this area and if so, what should i get?