The cloudy water indicates a bloom of beneficial bacteria to digest ammonia and nitrite, monitor these levels carefully. Generally an aquarium should be cycled slowly with only a few fish (just the danios) until this bacteria gets well established. Watch the peat. It is unpredictable and may crash the pH down I generally use it on the side only, never in the aquarium, use it to filter and soften water before adding it. Keep the pH low as any ammonia developed will be nontoxic at a Ph below 6.0. It sounds as if you need to read some books, that is way to many fish in a new aquarium and I think your local fish store is unfortunately misleading you to sell more fish. You can use R.O on hard water but the membrane life may be shortened. I would seriously recommend using one as they make life alot easier, make sure you get one with a TFC membrane I recommend Spectrapure. Then you can forget about peat and use peat extracts which are far more controllable I like MoroSan because it doesnt discolor the water. Some rocks namely limestone and some sandstones (calcite bound) will raise the pH. I think a 20 is too small for all those fish, Curviceps are agressive feeders and will cause problems. Nijsenni breed in ph below 5.5 and to get good color and vitallity as well as avoid dropsy from kidney failure must be maintained below 6.5 at a minimum. Personnally I say don't trust anyone buy a stack of books and avoid anything published by TFH. ------------------------------------------------------------------------- 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"!