I've had it for about a week and a half now, and brown spots keep showing up on the established leaves. Many of the new leaves (though not all) are turning brown starting at the tips.
I have a 10 gal tank with 2 13 watt 6500k CFLs. The water line is about an inch from the top of the tank. I have the filter baffled so that the frogbit stays pretty much in the same spot, although I've been doing water changes once a day for 4 days now due to my betta's injuries, and the frogbit gets moved all around during the changes. I hadn't been putting any ferts in- I put some Flourish Comp. in 2 days ago and the brown spots actually seem to have multiplied. Some of the roots are rotting as well. Any help to keep my frogbit alive would be much appreciated.
I am trying to keep it trimmed by cutting the brown leaves off- though it's really hard to just snip the one and not cut the healthy leaves since they grow so close together.