hey guy yesterday i posted that i have alot of build up on my tank well after i applied the sock and took out the media the water started to clear up i just came home from school and my tank looks green again and a another fish died whats going on here i dont understand how is a sump better than a canister,when i had my fluval 404 my tank was crystal clear.my sump like i said has three parts skimmer-fuge-and return also i hanged a filter on the back of the sump which contains carbon i put it in the filter because the other bag i place on the return portion poped and some carbon went into my tank and i dont think its water flow because if that was the case i would of had this same problem with the fluval ,please help me out,this forum was created for a reason