Ok so I came home today and found this little fish swimming around the back of my tank...No idea how it got there. I haven't purchased anything in a month. I dipped The corals that I bought. I only feed frozen mysis, rods, and marine pellets. My last fish purchase was a month and a half ago from vivid aquariums and none of them are old enough to breed, besides I don't think it isnt any of those types. I have 2 clowns one male carpenters wrasse one wheelers goby. Fire shrimp and tiger pistol. Any ideas?