i am new to this hobby,
but all the information i have gatherd was undergravel were a wast.
(but thats what i have been told)
and i have a 4ft tank housing 3 large oscars
2 tigers.
1 albeno.
o and 2 brisle nose catfish
and they are all really happy living with each other but quote
(
jizon82) their bio-load is crazy
but i am runny a jebbo 1300L pHr.
but back to your question i had them when they were all about 1-3 mn old.
there was 4 but they picked on him and i had to move it to another tank.
but he lives with 2 smaller fish quite happly. he tells them hes boss but he hasnt tryed to eat them.
(and hes about 20 cm larger)
oscars are my first reall fish and i havnt had any major problems.
feel free to ask me any questions about their behavoirs and ill try get back