I've been dosing the ATI Essentials for 2 months now, that's the soonest I could get it here in Canada. Growth and coloring in corals has been fantasitc but I am getting what I assume is a bacteria build up on the return pump/pipes and the drain pipes. It builds up within 2-3 weeks and starts letting loose into the display tank when the return is shut off and back on for feeding. The only thing I am dosing is the ATI Essentials, I feed one time a day and use Amino Acids at 1/2 the amount listed every 2 days. I checked my dosing containers today to see if it was present in any of the solution and it looks to be coming from the #1 Alk mix, #2 and #3 are perfectly clear still. This was only mixed 16 days ago with fresh made 0 TDS RODI water. Anyone have any ideas what would cause this?