Holy Cow!
Icecap has done some revisions on those scrubbers. I dont know how to recognize the revisions they've made, so I dont know if yours is the most current version or not. I'm just throwing that out there for your information.
If yours starts to leak or the lid warps, contact them and they'll take care of you.
That's alot of growth!
Are you scraping both sides at the same time, or alternating them by a week or so to keep things more stable?
Pay attention to your levels as ATS' can strip a tank down too far, very quickly.
They are very effective.