In my 15 gal Ihave anacharis, wisteria, little bit of duckweed and moneywort, as well as 2 cryptos. The substrate is sand, and Ihave root tabs for the cryptos. It seems my anacharis and money wort and even wisteria are slowly losing leaves and just 'melting away.' The temp is 76 F. Wisteria has tons of roots coming from stems/leaves, but tops are turning brown and more floppy. They're still submerged. Anarcharis is the worst(isn't growihg like a weed very well...) leaves just completely fall, leaving me with random, stem that has to be removed. My java fern also died in here...(turned black/brown) money wort isn't too bad but leaves still aren't what they should be. Duckweeds just annoying and gets into filters...(if anyone has ideas to stop filter blocking duckweed without removing the duckweed.. let me know ) lights are low lighting, on 12 hours a day. Barely any natural light. Do Ineed less light? Lower temp(betta in this tank/stock in profile) nitrate around 20-this was couple weeks ago. I usually add apI leaf zone5 ml once weekly after water change.. tired of these 'easy growing, non killable' plants dying.. is it the sand? I take off leaves at bottom and bury stem into sand, no root tabs for these ones as they're water colomn feeders from my understanding. They all grow in my 29 gal, but substrate is for planted tanks, lights slightly higher and on 12 hrs as well. Temp is degree or two warmer.. but my moneywort in 29 seems to be melting as well-they get pin sized holes in them then just disappear/melt(especially if touched) could holes be from mystery snails? Btw thanks and sorry for long post!!!