2.5 gallon vivarium
So one of my 2.5 gallon tanks busted a leak. The tank is 12" X 6" X 8", but at the 5-6 inch mark, it start leaking (this is even with replacement silicon sealing...). So I want to make a vivarium out of it. I've got potting soil from my foray into emersed growth, calcium carbonate sand from my saltwater tank, coconut coir from trying to culture earthworms, and black sand from a tank tear down. I may also have a few worms here or there. I definitely want my last Anubias nana var. petite plant in there, a few stalks from my Hygrophila polysperma, possibly my banana lily plant, and hopefully one of my mom's orchids. I may also decide to plant some of my leftover plants when they get too big and need to be pruned. So...
1)How do I mix the soil? I know that I need nutrients (the potting soil), something to buffer the soil (coconut coir and calcium carbonate sand), and potentially something to cover the soil (black sand). I plan on adding earthworms to the vivarium to keep the soil nice, and a neutral to acidic environment is probably best based from my aquaria. Is there a good ratio to look for?
2) Have I chosen a good assortment of plants? Is there anything that I'm missing?
3) Are there any beneficial organisms I can add to the vivarium? Preferably something that I can harvest to feed to my fish?
So many fish/plants/inverts to keep, not enough aquaria.