Yeah, U. Gibba is an interesting little plant I must say. It's carnivorous and as you noted, grows like mad under that right conditions. It's also very fragile which makes it hard to get rid of.i don't know what it is but with co2 and fertz it grows like a weed!
Carnivorous to smaller micro organisms. Fishies and inverts have no worry. You're safe.did a bing search could find nothing on it being carnivorous, sources please?