I bought myself one having a std 4ft tank, but unfortunately he didn't make it! I only did this as I am planning on upgrading to a +/- 800L within the next year and would not have had space issues as I bought it small.
always get fish that are suited to your tank size as adults and are compatible as a general rule to each other. There are always exceptions to the rule but plan on accepted practice. Learn from others mistake.
You did well not getting him fella, start saving for a 3m and use your current tank as its sump