Adler, sometimes older leaves tend to get black beard alga...or just die as they adjust to your tank. The tops look healthy & happy, so wait a few weeks & snip off the pretty tops & replant. Toss the old "stumps".
If you have more issues, maybe start your own thread so we don't take away from tackful's. It sounds like "he" has a better grip on "his" problem, maybe diatoms?
If you have more issues, maybe start your own thread so we don't take away from tackful's. It sounds like "he" has a better grip on "his" problem, maybe diatoms?