hello recently bought a rio 400 the 450 litre version, still got all the mbunas i had before. afra haras, acei, chailosi, saulosi, auratus n labs. saw the crytocara moorii ages ago n really wanted one when i had a rio 240. but got told on here that is wasnt a big enough tank n they need to be in groups. is my 60x20x26 inch tank big enough n could i get away with just one moorii if i added a few other haps? thanks.