First of all, welcome to the best site in da world
Congrats on switching to the dark side(salt lol) and for starting with a 75gal.
Having a fowlr is the easiest to take care of, IMO. The fish selection that you have picked sounds fine for a fowlr tank. If you where to later change your mind and want a reef tank, you might have to get rid of the last two on the list. Some ppl have a CB with a reef tank with no problems, but I wouldnt take the chance.
As for the R/O water, Yes, DO NOT use tap water for top off. R/O is the best that you can get. There are different ways to introduce the R/O water, I just pour it into the sump from a new 5gal gas container. When you do travel, you can buy an automatic feeder if your parents cant pass by. The good news is,for you, a fowlr is the easiest as in maint. and least expensive to start. Good luck and if you have any other Q's, please dont hesitate. Luna
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9YR OLD 90G/55g custom sump/refug Mag18 Aquac 180skimmer 692w MH AC jr,yel&kole tang,midas&convict blenny,B&G chromies,Blk/yel fin chromie blackcap,nemo,neon goby,6line; Blastomussa Merleti,Acan ,BUBBLE,Torch,LTA, Acropora(2) Moon, assort zoas, yel& G star polyps, P&B ricordia, montiporas, cup&candy corals, xenias,B/G mush,flower ane(2), cherry red mussa, dusters,cleaning crew..
