Mephistopheles wrote in
ink.net:

uths, rainbow cichlids (Herotilapia multispinosa), N.
brichardi are substrate breeding cichlids that should do well in your
water conditions, are usually easy to breed, and do not get too big.
Yellow labs might be a good choice for mouthbrooders -- but you would
want to get one male and several females, not just a pair of these.
There are many other cho

Thank you both for your quick responses.

Firemouth, Convicts and Rainbows were the ones I had looked considered.
They grow fairly large though 20cm for Convicts (I read.) Would they not
grow too big for a 20gal aquarium? Would an upgrade (in a few years or
whenever) have to be a consideration?

Another question, how many eggs are they likely to lay and how many
spawn?

--
Regards

JTC ^,,^