I am planning on setting up a 15 or 20g tank, and I was hoping to keep a citron goby. I thought its very small size would make it a good canidate. However, today I was reading an article in reefkeeping magazine about gobies, and it said they need acropora corals to perch on. As my tank will be light by PCs, I have no intention of keeping these. Does the goby really need these corals in the aquarium, or is this just it's natural hangout. Thanks.