How big can I go while keeping the same light?

[SeaHorse_Fanatic]

Scott,

If you're filling a 40g tank with store-bought water, at about $5/5 gallon, you're looking at $40 just for the water & it'll be a pain transporting that many jugs of water (8 jugs total). You're much better off adding $100 or so to that to get the RODI unit from Aquasafe, instead of upgrading later & wasting your $ now. It's really a worthwhile investment because you can use it for drinking & cooking as well.

Most of the local reefers have one & love it.

Anthony