I'll post some pics here, just taken. Photos don't do him justice. Looks small to me in the photos, even normal. lol I'd guess he's easily over 2 feet, but the most impressive thing is his girth width-wise. About 5 or 6 inches across.
As for the change rate, nothing unusual there. Same schedule, once every 28 days like clockwork. A media rinse in aquarium water and run crushed coral in sump along with a Nitra Zorb bag a week before the water change. By the way, the crushed coral doesn't help much. He still runs acidic. I might change the Nitra Zorb bag based on a comment above. Can't hurt. Tank smells better, less free ammonia smell. However, I ran a test and it seems to have gone up a bit, around .4. Worried the change yesterday may have unsettled the filter a bit. Think I'll hit him with 2 or 3 caps of Prime and see how it looks tomorrow. Test could be reading ammonium since the tank seems to smell less toxic. Still no distress. Same ole pac man.
I had an awful new tank cycle when I first set this tank up years ago, so I know the worst of it. This is nowhere near that, but don't it to progress, and don't want to overreact and make things worse. Helluva thing.
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Anyway, thanks for your comments. I'll keep you posted.