I started my tank 3 weeks ago and has already gone through the cycle. I only have live rock and live sand and thats all. I got my water tested 2 days ago at the LFS and they said my PH was low(7.8) and my salinity was too high(1.028). I just added buffer in two days and it seems to be at 8.2 now. Is it safe to add soft corals now and maybe a few nano fish.