Hey guys I have aa fluval 13.5 for 4 months. Everything has been going great, corals are growing and my fish are doing well. Right now the livestock is: 1 davinci clownfish, 1 neon blue goby, 1 green clown goby, 1 cleaner shrimp, 1 nassarius snail, 1 astrea snail, 3 hermit crabs, 2 bumble bee snails, 4 heads of frogspawn, 1 red montipora, 1 green zoa with about 13 heads, 1 duncan, 1 favia, a rock of gsp and a rock of xenia. My rock work has a lot of caves and hiding spots (my clown goby is the only fish that chills in there tbh). Could I get another fish? I was looking at royal gramma, hectors goby, or possum wrasse. I have pretty stable conditions and don't want to mess up the tank, I do plan on adding more corals in the future (prob just more zoas and hammers) and some macroalgae and/or mangroves later down the line.