Tank and Fish Size
Severums grow to a maximum size of 12 inches/30 centimetres (a foot long), sometimes even more in the wild but are rarely seen passing that length. The Severum is usually sold as a small fish around 2 inches at your fish shop. This often misleads people into buying these giants to be. They can also grow deep in size (like a discus), so therefore, a large tank is needed.
Only one Severums may be squeezed into a 55 gallon tank, but with that you don't have many options open for tank mates, In a 55 gallon tank you could probably have a pleco as a tank mate, but that wouldn't be interesting would it? So you would be aiming to go to the next step, a 75 gallon tank. With the extra space, you could add another Severum, but they should be upgraded later in their life.
Tank Mates
Severums are usually peaceful but, keep this in mind, large. So therefore you could get a large range of tank mates for them.
- Large Tetras(Such as the Black Widow etc) Large Danios (Giant Danios),Rainbow Fish, Hatchet Fish etc etc
(though when selecting these fish make sure they're at or near their maximum size and get a large school (6-10), But fish such as Rasboras are small but fast, and since the Severum is a slow swimmer, these should be fine.
- Other cichlids that could possibly be kept with sevs include: convicts, blue Acara, oscar, Chocolate cichlid, Festivums etc(these fish are not to be kept with fish with large open mouths as they are the smallest of the bunch) But beware, these fish should not be kept in pairs as they will breed and get territorial and cause havoc in the tank. Also remember that when keeping an oscar with a Severum, the tank must be 125 gallons minimum.