Hey everyone, long time reader first time poster type of deal. I've gotten a wold of info from reading your posts on here so thank you in advance! I'm almost a year in to my tank and there are a couple questions and some things i'd like some opinions on... I have 2 Kenyi (a male and female) and 2 Red Jewels (also male and female). The tank is 110G with a built in overflow box.I have a 30G sump pumping around 650GPH and a Haggen Aquaflo110 on the back of my tank.... The questions I have are 1).. I use bioballs, filter cloth, ceramics, and carbon for my filter media. I have great circulation and water movement but am I getting enough oxygen into the water?. 2)...My male Kenyi is super aggressive but more of an annoyance to everyone than a threat or a problem. Should I consider adding a couple more females? I've read that could help but will that overload my tank and is it too late or not a good idea to introduce new and possibly smaller fish at this point?