I have a 36 gallon bowfront freshwater aquarium with 4 Upside Down Catfish, 6 Zebra Danios, and 5 Golden Cloud Minnows. The tank is fully cycled, does not contain live plants, and has an Aqueon Quiet Flow 50 filter. Would adding 2 more Zebra Danios, and 2 or 3 more Golden Cloud Minnows overpopulate my tank? I know I could only add 2 at a time. Thanks in advance for any input