Im getting a 75 gallon tank, I have an oscar thats probly 2.5-3inchs and a blood parrot the same size, if I were to get a elec. blue dempsey would it be alright in my tank? I've heard they stress easily when theyre young.
Fully grown Oscars need at least a 75Gal tank to them selfs , so if you upgrade later on to something like a 180Gal for the fish you should be ok for like 6/ 8months with your 75Gal , IMO .
i had the same set up in a 45 gallon for 3 months before i noticed stress on the fish, they were all between 4 to 5 inches long, i upgraded to a 100 gallon for them. if you had plenty of places to hide they would be fine for a while but the oscar and dempsy like to grow and fast.