New to reefing.

[BigA]

Hi everyone!! BigA from Edmonton here. I am new to reefing and this board and I have some questions. I have recently started what will be a reef tank eventually. 29gal tank, 30x12x18. Eheim 2224 canister filter, Coralife Aqualight PC's- 130W. Hydor Koralia 1 powerhead - 400 g/h. Salinity level of 1.023.

On this past Saturday I purchased 11lbs (Couldn't afford to do more than that at the time. Will be purchasing about 20-25lbs more) of Tonga LR from the LFS. Brought it home and through it in the tank. Over the first couple of days, I watched as it turned a bright white. Haven't seen much for hitchhikers, other than a few bristleworms (I think). Now the rock is turning kinda of a rusty brown color. Not fuzzy or anything. Just turning a gross brown. Is this a problem issue? Or just part of the curing process? Any other recommendations for me as I progress?

Thanks in advance.