I'm a complete newbie. I have my first ever Beta and I gave him some plants. An Anubias, which is doing really well, and a banana plant. My banana plant did not have anything growing, leaves or anything, just the "banana". I figured it would take time, but the whole thing turned pretty dark brown right now and has a fuzzy white algae developing on it. I have been cleaning it, and fertilizing it, but I see no change (it has been about a month and a half). How can I tell it is dead?