I have 15 gal tank that is about 2 months old. Stable, water is clean, fish
happy. Java fern is nice and green. Lillys seem to grow good. However,
hornwort and frill will grow for a bit and then turn brown and die back. Is
this normal for this plant? I've grown hornwort before, and it grew like a
weed, but I'm not having much luck now. I've put plant fertilizer in the
water, maybe I need to setup a co2 bubbler? Is there any type of water test
that might help?