So I bought total 6 fish so far for my 30 gallon tank which used to be a Goldfish tank. I bought a heater and some plants too. However I feel like I should return two of my Gourmis, a kissing gourmI and my Blue gourmi. The Blue one is semI aggressive and has been acting kinda upity to my Bolivian ram cichlid. I thought it may calm down but it hasn't. Also I did some research and found out the Kissing GourmI grows huge (should have checked first)! So I need some opinions. Should I return them and get new fish or not?