Well the ph I had at 5.9 2 days ago when I put fresh nutes in, and this am the ph was 5.3. When I did the nute change I ph the water first to 5.9 from , 6.3 (tap water) then added the nutes, the ph then dropped to 5.3 and I had to keep adding ph up. Am I suppose to keep adding and adding ph up...