Seachem's "phosGuard" containing aluminum.
gfo= Granular FerricOxide
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but they have been steady with Alk = 8 - 10 dkh, CA @ 380 - 420 PPM, S.G. = 1.024 -1.025 and PH around 8.3.
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That's not steady! Try to keep your parameters fixed.
Regarding the leather it is most probably shedding to grow larger