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Clea stay partially hidden under the sediment, and if a snail slides past, then quickly (by snail standards) jump into action, chasing their prey and eventually subduing it.
Do I need to supplement food for the assassins, and what do you recommend The fish and shrimps do a very good job of cleaning up before the snails move around. Is it wise to add some "pest" snails for them to chase/eat?
If you run out of snails for them to eat, and can't get any pest snails from the LFS, you can feed bloodworms or shrimp pellets. Pretty much anything with protein, mine LOVE shrimp pellets.
I think my assassins are blind? I placed a pond snail directly infront of a moving assassin but it just slid passed. I tried again, and several other times but it just ignored it. Eventually after about 20 minutes of moving the pond snail it got linched and ate