Hello friends,the 55 has been up and running just beautifully.It consists of three blood parrotts and three raphael cats.The bio load is managable and the tank is well aerated.I would like to add some tetras ,as the parrotts hide and so do the cats,the only time the parrots come out of their logs is at feeding times,and the raphaels seem to be nonexistent.However two potential problems may arise that I need your counsel about.One ,could this already be, tank overload,and two, this is a healthy tank,no fatalities and thriving,growing fish.I have no quarantine tank to foster new arrivals.Arrivals that may harbor disease.My parrotts are very social when they do come out,to greet me.Should I just let it be?-D