I do a half-dose 3 times a week on my planted tanks and this my val tank.
I think you need the right light for Val's and when they have that right light, they can use the carbon in excel properly. If they don't have the right light, they can't use it fast enough and they melt. That whole tank started with 1 3" tall val I bought and it stayed 3" for like a year because it was really low light. Once I moved it to a new tank and did better light and some root tabs, it took off so much that tank, all the other plants are coming out and it's going to be a val only tank.
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