Making a DIY shrimp barrier for a HOB filter Hang On Back Sump
The idea is, water is pumped in chamber 1 with the heater spills over on to filter floss thru sponges, then to purigen packet (not shown), then through media This could happen for a number of reasons including too strong of a return (gph) from your pump or evaporation. Typically, hang-on filters and AquaReady's Ultimate HOB Filter for Saltwater Aquariums ...