I have a 12 gal. Fluval Edge that has been running for about 3 months and is completely cycled. I have driftwood and some plants (1 anubias, 1 sword plant, and 2 marimo moss balls) and have been slowly adding fish and currently have 5 zebra danios, 2 oto cats and a guppy. I am thinking about adding harlequin rasboras, but don't want to be overstocked. Would 5 harlequin rasboras fit in with my crew?