This is a beautiful tank!!!!It is a 32g, I was just going to have one conch but after not having seen my original for a month I got another one. Within seconds after placing the new one in the original came flying out of the sand. I think they are in love. My diamond goby was a little messy the first month or two but once it made its permanent burrow it chilled and I haven’t had a problem since. I’ve had him/her for a year and 7 months. I suppose all fish have their own personalities.