ok heres the next question, ive got the bio covered i believe (20l pond matrix) and def water movement and heater, but what about mech? i added pond clarifier, and it started to clear the water, but ive had to wash the filter socks 3 times in the last hour. is there anything easier? i was thinking fx5, but i would need a few i think and they get costly, what about a big fluid bed filter filled with kaldnes k1 and k3? i guess thats supposed to house macro organisms that eat poo. anyone know? worst case scenario i deal with ugly water, but i will know its bio good. plus if i ditch the filter socks, i can turn up my hammerhead pump