Re: New Nano plants melting
I doubt it is the heater, many plants can survive 86F. Testing the water temperature would give you the answer. And your Java Fern looks fine.
The plants that are melting look like micro swords or e. tenellus and crypts - they tend to melt when newly planted. I would peel off / pinch off all decaying leaves.
I would use cheap plant fertilizer like API LeafZone and watch the progress.
Overdosing Excel could be another culprit.
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