That's my experience with them. Nothing I have kept has ever touched them to my knowledge.
I found the best way is to drop half a coconut in the tank in the evening and remove it just before lights on next day.
They swarm to the coconut like locusts and you literally pull out hundreds at a time.
I found the best way is to drop half a coconut in the tank in the evening and remove it just before lights on next day.
They swarm to the coconut like locusts and you literally pull out hundreds at a time.