Hello, so I have bought a small bichir endlicheri (3 inches) to go in my 220g on the advice of my lfs...They are normally really good so I trust them. But I am slightly worried now that I have done my research (I normally never by a fish till I know all about it, but they didn't have the ornate I wanted) that they are bloody huge!? Have I made a terrible mistake or will he be okay in my 7x2x2?