I have a 37 gallon aquarium. We have had it for a couple of months, but are still very new to everything. I am curious if our tank is full or if we are able to add anything additional. I don't want to cause any overcrowding. Below is what we currently have. 1x Platy 3x Black Molly 3x Blue Guppy 2x Tiger Barb 5x Zebra Danio 2x Black Mystery Snail 1x Plecostomus Any help is appreciated.