Blue Dream DWC

Looking decent, but not a lot of frosting up with trichromes yet. pH from last res change still stable / slowly rising. Seems my EC gets down to like 650ish and then just hangs out there. Unsure what that means, so far. Jan 13th: pH started dropping, so as an experiment I mixed a gallon of nutes (same as the res change) and did that for an evening feeding and we'll see what's up in the morning. Jan 14th: Still dropped overnight to 5.4. So, maybe that's not it. Always appears to be good after a res change, so, that's on tap for tomorrow. Jan 15th: Res change, GH trio week 9 / mid bloom @ 85%, plus calmag & armor si @ 100%. Came out to 780ppm. I'm ok that it's lower all said and done, another possibility is that the pH is dropping from too much nutes. pH'ed to 5.8 as per usual, and let's see how it lasts. Jan 18th: ec dropped slightly to 675 or so and has been stable there, and pH didn't even need an adjustment, basically hung out from 6.0-6.2 until it dropped to 5.7 tonight. I adjusted it up to 6.0 and I'll see where it goes. I keep feeling this is when I should res change, but every 4 days seems, a bit much.