Hello, I was going to be adding a larger fuge to my 75g reef tank and was thinking I could accomodate a pair or two of sea horses if I make the fuge big enough. I read height of the tank is the key factor in sea horse setups, so what is about the minimum height you would want? 18?-24"? I was wanting to put the tank under my main tank so it can be gravity fed. I have the room for a 10g standard tank but a little taller. Would a 20g tall be ok?