Suggestions for a water filtration system?

[Linguisa]

I'm planning to purchase a water filter to set up my Arlington County home. I have a 38 gallon tank with three fish, two large corals, a handful of mushrooms, two shrimp, and a bunch of 'cleaning crew' critters. Any suggestions for type or brand of filter? Is it necessary to get an RO/DI unit or will an RO unit suffice?

 

Thanks and happy new year!

[L8 2 RISE]

I would go with an RO/DI from our sponsor, airwaterice.com, only way to do it imo.

[Coral Hind]

An RO unit without the DI will work fine.

 

+1 on the AWI recommend.