Honestly, I do not use sponges at all. My girlfriend and I have 1 display tank (her baby), a 20 Hex (soon to be my office tank), and my breeding set-up, which consists of two 20L's, two 10's, and two 20H's (all she will let me have right now). The display tank runs on 2 filters -- a fluidized bed driven by an aquaclear 301 powerhead and an eheim canister with a surface extractor intake and spraybar. All 5 20's run on aquaclear 200 power filters and the 2 tens run aquaclear mini power filters. When I am worried about fry being sucked by the filters (which is not too often as the mothers seem quite capable of keeping the fry away from the filter intake), I put what I like to call "filter condoms" over the intakes... basically a piece of filter felt sewn together to fit over the intake tube. The apisto's and their fry have not seemed to have any problems with this arrangement. Just my solution to the problem, --Cliff ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@majordomo.pobox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@majordomo.pobox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!