I'm in love with this fish, my LCS has 2. I'm pretty sure my tank doesn't have the requirements to house one, but figure I'd ask anyways. Minimum tank requirement? A deep sand bed is the main requirement for these guys? I also have a watchman goby, so that would be a no go i assume. My tank is also only 25 gallon so I'm sure I'd have to wait until I upgrade to a 40 or 50 gallon. How difficult are they to keep overall?