Forgive me for asking for clarification, but if I read the original post correctly the 30 gallon tank in question has a height of 70 cm. (28" if my brain is working ) and the poster was asking about housing 5 - 10 pairs of apistos therein??? I assume this tank would have about the same (or less) floor space as a 15 gallon tank, and as such would house a pair or trio well, along with some upper-water dither fishes... The capacity of a tank to house bottom-dwelling, territorial fishes (like apistos) is determined by the area of the tank floor, not by how many gallons of water the tank will hold. Martha ------------------------------------------------------------------------- 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. apisto-digest@listbox.com also available. Web archives at http://lists.thekrib.com/apisto