Keeping a saltwater tank in a basement suite??

[2bafish]

In a few months I'm moving in a smaller size home. From a 2500 sqft home to a 1000 sqft basement suite. Needless to say I have to sell my 8 foot fish tank. I would like to get a 90 gallon fish tank or something like that. I'm wondering how some of you who live in a basement suite keep saltwater tanks. There isn't allot of room for rodi water bins for top off ato units or premixed salt mix. I would like to know how some of you manage to keep saltwater tanks in a basement suite. Any advice is appreciated.