Hello, I want to start a tank myself but I feel I am missing some info. The fish I plan to get are some Cory cats, enough for a school 5-7, and adding some ghost shrip soon after or maybe later add some neon tetras or cherry barbs for the top of the aquarium. First off will a 15 gallon tank be enough for that many cories? Also I want to setup an open sandy bottom tank with few scattered rocks/decor and a cave near the back right corner. What would I need if I wanted a sandy bottom? The reason for a setup like this is I love seeing the fish swim around and with the cories feeding on the bottom it would look quite bliss! I will be doing water changes every weekend because that's when I clean my dwarf hamsters cages. I mention this because I am wondering about the hardiness of the fish. Being my first fish I would like to see them live and be less stressed, by the way I am going through the nitrogen cycle fishless. Would love lots of feedback, haha, Thanks!