Set up a 20 gallon planted tank about two months ago. Just recently, last week up to now, my plants are found floating at the top of the tank after every night. These plants found at the top have no roots and a soft, rotted stem up to where it was in the substrate. Also, they are losing leaves very quickly. I think they are doing what's called "melting"? They are turning black/redish, and falling off. I use black fluorite and seachem plant substrate. Do my plants have a disease or am I missing nutrients or bad lighting? I'm useing an old reptile light hood with two 90 watt regular room lights. Have not been using flourish liquid dosing (thought tank substrate would suffice) any pointers on how to fix this? This is my first larger planted tank. Usually do planted nano tanks.
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