This is the thing with only having a small number of fish per tank, The
water does not require changeing as often , I am not saying that water
changes are unnecessary, But you don't need to change that much, that
often.
bassett

"Mary Burns" wrote in message .
Depending on the size of the other fish, your tank is/will be overstocked
will lead to agression sooner or later.
Clean water is vital for angels to grow too, and they need regular water
changes...2 or 3 times a week. Mary