hi. in my 75 gallon ive been raising 2 jack dempseys which are now about 4-5 inches they have been in the 75 for approximately 2 months. and today i got a coupon from the pet store so i went and bought two blue acara both around 4-5 the pair for $6. so i came home and remodeled the tank with many rocks and a few large peices of driftwood. so far they all seem to be getting along i mean they all stay in a group together.i also have 6 tiger barbs and about 5 small cories. does it seem like to many fish or should i be good for a while til i can get another large tank.