I use plants in my breeder tanks. Are most of you? Plants will during photosynthesis cause the ph to go somewhat neutral. You can counter act this effect by adding CO2 to the water. Use a yeast reactor on a small tank. Check the ph in the evening though the first couple of nights or right before the lights come on as to much CO2 will cause an acid fall. BRAD ------------------------------------------------------------------------- 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"!