snap a leaf off umbrella and give it a sniff. Just so you are framiliar with the smell, if it's starts to gas that tank u'll know. Red are small enough I don't think they'll break a leaf. And they might not even climb it. Like I said, my 10gal was stuffed with a bent stressed plant. It didn't kill my frog, but reaction was within 2 days.
They're in allot of vivs, don't stress too much, just smell your viv, watch your frogs, and be aware.