New red devil + flowerhorn

i got my new fish today, i got 2 small cichlids, 1 red devil and a flower horn. i know these fish aren't going to be able to live in the 75 for their whole lives thats why im saving up to get a 50 to put one of them in. but surprisingly aggression hasen't been an issue, on the cichlids' parts anyways. my yoyo loach and 2 corie cats have been chasing around the two "aggressive" cichlids all afternoon; not doing any damage of course. the cories and the loach are all smaller then the fish, so size isin't the issue. they basicly just suck onto their sides and it pisses the cichlids off and they just swim away in a timley manner. is this normal, or do i have some vicious bottom feeders?

PS i re arranged my tank, got a new flourescent light and currently workign on a background, made of black posterboard.
Pics will be posted soon!