Hi I need help stocking some fish into my 10 gallon tank all I have planned right now is: Stocking 2-3 otocinclus (my tank has been running for about 6 months) 2 or 3 java fern (not a fish but a plant) I really wish a could add a single betta but I dont have a back-up plan if it doesnt work, also I really want platy fish but I dont want to have babies and if I keep all males I have read that they will be aggressive with each other. If I get all females they could have already been pregnant from before and have babies in my tank also I have read that the female platies arent as colorful as the male ones. Dwarf Gouramis are also an option but I heard they get sick very easily. I have been considering black neon tetras are they easy to keep? Can they catch the neon tetra disease too? I would like any of your opinions on what else I can add to this tank. Thank you. Also I had a quick question since I thought it doesn't need its own thread. Is it safe to add some more gravel on top of an already established tank? I have a mix of white and black gravel and I want more black so I bought another bag of gravel, is it safe to add that on top of my old gravel without ruining the beneficial bacteria?