Reduce your lighting to 13W. 18W abit too high. Especially so you are keeping lightly planted.
Also if you are doing Excel, you have to keep to the dosage and do it regularly. Else BBA will SURELY appear on your DW and glass.
Also, be prepared for melting of Vallisneria nana in the beginning as well. They need an acclimatisation phase.
Just go for crypts. One way to circumvent the melt is to float the plants for a period of 1 week or so.
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