I just checked again, all 3 tanks are at the same ph 7.6, gh 30, kh 180 which is normal for our water and I don’t use anything to adjust it. I have another smaller crypt in that tank that looks ok so far, but I’ve only had for 6 weeks. Pogo, anubius, val, dwarf lily, duck weed all look fine, fish and snails are healthy. Nitrates down to 10 after a water change and I haven’t changed my maintenance schedule. The affected crypt has 5 leaves left but don’t look like they’ll survive. 🤔
Thanks for the help!