I have 5 planted tanks (and an unplanted quarantine). I have a mixed bundle of plants and regularly use flourish comp and was using excel in combination with this until recently. I've noticed my marimo moss balls, and java moss browning lately in a couple of the tanks I had just started redosing excel in due to patches of the dreaded blackbeard. Could it be the excel doing it? I've read it can cause jungle val to melt too.. I'm weary of using it in the tanks I have val, moss balls and java moss in.