What about your tap water? Do you know what's in it? Do you outgas for chlorine? If your tap water is chlorinated as most are, you should outgas{let it sit for at least 24 hours}before using as
@JayBo.Gart suggests. You should be able to find out what is in your water by logging on to your local water authoritys' web site. They are required by law to post this info for the public.
Also, be careful about adding too much Ca+........lots of tap waters, especially those in the east are loaded with Ca+ due to all the limestone formations in these areas. I also have to agree with Jaybo concerning your pH........I think it is too low.....I grow straight perlite hempy and keep mine between 6.0 and 6.2. Good luck with your grow.....Hang in there and keep it simple!