I have a Severum in a 55gal tank. Besides the Pleco, all other fish are low waste loads. If need be, I could probably buy a 100gal filter. Not at the moment, but in the future. After doing a lot of searching, sites can either say 55 or 75 is the minimum tank size. Some sites even say 100. My Severum (a he) is at 4 inches long since I got him in March or April. Will he be fine in this size tank, at adult size of 10-12 in? I am getting a 3rd tank in December, but it is marine. If the Severum were to outgrow this tank, I would probably get a 125gal... if I had the money or anywhere to put it. But some sites say a 55 is fine. He also has plenty of room to swim. It is lightly decorated, a fake log, a rock, real and fake plants. Not cramped. He has grown over twice the size of purchase.
Oh, and this is 55USG, and a long tank, not tall. 48in - 12in- 21in
Oh, and this is 55USG, and a long tank, not tall. 48in - 12in- 21in