There is so many articles posted regarding this issue(Cycling /RO use). Is using seachem prime fine WITHOUT using RO water

As you can tell I am new at this , bought a Tom product rapids pro PS4 filter. The automatic feed for make-up water I believe is about 4 gallons. I am using prime for this make-up water and everything seems to be fine. Unfortunetly everytime I visit a store someone tries to sell me something I have to do research on and most of the time I dont need it and "there" way is the best. I have to be about 3 weeks or so give or take a few days in the cycle on a 55 gallon Ph 8.2 Ammonia 0 Nitrite 1.0 Nitrate 10 .
Along with having some red (diatoms I was told they would go away with a slight stir ) on my 3.5 inch live sand bed. Protein skimmer is built into my filter which I am cleaning and seems to be working fine despite some reviews. Using 2 hydor 2 powerheads and my tank is turning over about 55 times an hour with a temp of 78F and T5 lighting full spec and blue atinic. All my electric is off the floor and secured to the cabinet underneath with timer for my lights. Only four fish two blue green damsels one yellowtail and one domino damsel. Ok what do you think of that ,lay it on me. What should I do what haven't I done what did I do wrong
