Yes on all the above,
get rid of the tap water
Get the R/O unit
No to the shark
Scrap the bacto-in-a-bottle
buy as much rock as you can
..and did I read that right? a 30 gallon sump?
What are we skimming this with?
IMO , get at least a 75 gal sump for the overflow and a large Skimmer. That is a BIG tank