Most times you want to premix you salt with your Rodi water first. That you you can test your salinity prior to adding it the tank. If its off you can fix it prior to adding to your tank
Def. agree with breedlove's statement. Didn't know if you're having a FOWLR or a reef setup so just listed what I could think of:
-Filter (recommend AquaClear)..or sump if you're willing to go advanced, but not needed
-salt (I use red sea coral pro salt, but instant ocean reef crystals or their standard salt works)
-mixing bucket & powerhead for mixing salt
-aragonite based sand (if you want sand sifting gobies and nassarius snails and such, go with a small grain size)
-powerhead (if you want corals, otherwise it's not really needed
- you could have a protein skimmer, but the tank isn't that big so it's not necessary
-LR or base rock (I went with BRS pukani dry rock...could do mostly base rock and LR to seed the dry rock if you want to save on money)
-hydrometer
-TEST KIT! very important, an accurate one is very important if keeping corals, if not an API test kit will do
-Lighting for corals if getting them...PC, T5, T5 HO, MH, LED..all work, but some only grow certain corals
