First of all, I hope this topic is correctly placed here. Ok, I'm planning to put a 10 or 15 gallon tank with corals, my first option is to keep zoanthids, discosomas and star polyps, or any coral for beginners, for which I already have a handful of information, but my second option is to place an NPS tank, with sponges, christmas tree worm, gorgonians (maybe), and tubastreas, according to this, what are the requirements? What equipment do I need for a tank of this type and size? What do I need to successfully maintain these species?