Hi guys, I'm about 3-4 weeks into compressed CO2 (GLA system). I'm up to about 5 bps and have the drop checker green, but not light green, yet - slowly increasing. I have 2 photoperoids, 1.5 hrs in am, 6 hrs in pm. Currently have 1 T5 HO light with a 6.7k and a 10k, and getting a second T5 HO light this week which will have 2 6.7k in it. I am using an atomic diffuser in the middle of back of the tank (you can see the tubing in the center of the tank in the pic below). I have 2 HOB emperor 400's on each side of the back (again can see the intakes on each side on the pic below). I have an intank UV sterilzer I run about 6-7 hours/night. 90 gallon aquarium with small gravel as substrate - put it in the tank prior to learning about planted aquariums. Temp is ~ 78 degrees, pH in the high 6's. Zero nitrites, just trace nitrates. Water is RO water that has been run through a whole house carbon filter plus a water softener.
Plants look great, water looks great, fish are living and growing great. Issue has been BBA recently. First on the crinum on the left of the tank and the 2 little tufts of microsword (which have done nothing since their introduction about 2-3 months ago), next on the leaves of my swords as well as the wisteria, now on the leaves of my ludwigia. I've attached some pics of what I have going on. Livestock-wise, I have a bunch of angels, 12 small BN plecos I've added recently, a couple "giant" otos, and an irridescent shark (a family favorite I can't get rid of).
I've read up as much as I can on the BBA from Tom and others here on the site as well as other sites. I've added the UV, purigen, doing water changes as best I can for a tank this size. I've been slowly increasing the CO2, having it come on an hour prior to the start of each photoperoid and stopping about an hour prior the end of the photoperoid. I use Excel and have increased from a cap and a half to about 3 caps a day, thinking of going to 4 caps/day. I feed with Flourish comprehensive 2x/week, seachem nitrogen and phosphate 2x/week, and leaf zone once a week. I have some seachem fertilizer tabs throughout the gravel. I've trimmed as best I can, but don't want to decimate the plant through trimming (i.e., the mircoswords are completely covered with BBA).
Any other thoughts? Thanks in advance.