brown stuff on glass? does it form a sheet when you scrape it off? if so, it sounds like bga
if it just clumps together and it's slimy, brown algae
the best way is to do small water changes frequently, cut down on fertilisation
as for crispus, yes, but all you have to do is to remove the affected leaves, and add base supplements to it
it'll bounce back before long
use in conjunction with good water changes and fert regime
the other apon i have no idea
unless you know what type it is
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