Fungi means you likely have too much humidity.
Same issue with emergent Crypt growers etc........look at how they grow etc.
If you exchange the water nutrient solution once every 1-2 weeks, the tank should do well. But if you use ADA As or MS, then no such need........
Also, HC is not a high light demanding plant.
I wish folks would realize this and get over the HLD.
Use say 2 x 24 W or 2x 20 W on a 20 Gal tank(60cm long).
That's all you need.
It will grow fine and form a nice a dense carpet.
Regards,
Tom Barr
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