29 gallon supply list

Didn't think I would be posting here ever... yet here I am

I am looking for a nice SW interactive and interesting FOWLR setup centered around 1 or a pair of fish. Through research and asking around I have come up with 2 possible combinations...

-dwarf fuzzy lionfish
or
pair-maroon clownish(maybe add a bubble tip anemone later)

I am not concerned about aggression because these guys will be the only fish in the tank. So I am trying to get a running list of supplies needed. I would love you guys to critique and comment on my ideas.

so here it goes...

-29 gallon biocube
-Cobalt MJ1200(pump to replace stock pump)
-Jebao w10(extra powerhead)
-Instant Ocean Sea Salt
-heater(haven't decided what type yet)

I figured I would not need a skimmer if I do regular water changes especially on such a small FOWLR tank. I am used to doing 50% water changes for cichlids weekly so 10-30% is not a big deal to me. Is IO ok for sea salt since its fish only? Will an anemone eventually need something better? Also what are peoples feelings about RO/DI verses treated tap water for a system like this? I have looked at so many threads and there are a lot of disagreements. I will need a test kit and something to test salinity am I missing anything else?

I am still going through the process of reading and researching still so bear with me.

Thanks for the response. I did not plan on doing 50% water changes I was just stating how I am used to doing large water changes fro my cichlids so doing small water changes on this tank should not be much of an issue. As for skimmers I was thinking tunze 9002? What do you guys think about that? Any recommendation for a t5ho replacement for the anemone when that day comes? I might end up investing in an RO/DI system so I do not have algea problems but we will see.