Hi all. Im new to this form. Hoping for some help. I have a 135 gallon tank with 1 large (docile ) oscar. 1 large black ghost knife fish. 3 clown loaches and a pleco. Lastly, I have a firemouth cichlid. I am new with these fish. I was wondering if I can add a few more of them into the tank. Also. Can anyone tell me if its male or female. Ill add some pics of the tank