I've found that bare bottom tanks are fine providing the outside is painted (black). Initially I used black polythene on the outside of my tanks and it helped calm the fish down a bit but not as much as with painted tanks. Another alternative (especially for fry) is to fill - and I mean FILL - the tanks with Java Moss and with floating Ceratophyllum too. My fry are thriving in this tank and it looks like I'm going to raise > 90% of a brood of Dicrossus filiamentosa. Alan W ------------------------------------------------------------------------- This is the apistogramma mailing list, apisto@listbox.com. For instructions on how to subscribe or unsubscribe or get help, email apisto-request@listbox.com. Search http://altavista.digital.com for "Apistogramma Mailing List Archives"!