Ok i "inherited" 4 VERY LARGE red-tail sharks.. what size tank do i need for them..yes iam aware i might not get them to live peacefully in any size tank..but whats a good size to try?
I had two rainbow sharks (one albino) in a 75 with no issues, but when I moved them into my 20x20x36 (tall column) the albino took to hiding behind the filter tube and eventually perished... I think that having ample habitat low in the tank is the key, maybe 3-4 square feet per fish? Of course these things always depend on the temperment of the individuals as much as anything else.......Are yours getting a green shade along the back? ...yes....Very subtle and very cool.
If you set up a variety of bottom structures and not to many other bottom dwellers (loaches or cories maybe) the 90 might work. What size tank did they come from? ....dont know...meet in parking lot guy was gonna flush them ...