<a href=showthread.php?s=&postid=8080792#post8080792 target=_blank>Originally posted</a> by jeffbrig
In my 250g bare-bottomed tank, I started with a 3:1 ratio of ceriths and astreas (300+,100+). 18 months later, it's a 0:100 ratio. About 90% of the ceriths climbed out of the water to their salt-creep-filled deaths in the first few months. The rest were picked off by the mantis over time. The astreas are doing great, and I've had no need to replenish their numbers. I ordered all of my snails from keys critters.