How is this sustainable? Like you said you will never get rid of them all and you can't not feed your fish and corals forever. Its a loosing battle.I have had them for about 10 months now. They were spreading like wild fire until I got rid of all my fish and did not feed my tank a single thing for 6 to 8 months. I also added 50ish bumblebee snails to the tank (260g). After 6 months I felt like the snails didn't do anything but closer to the 8 month mark I started noticing a difference in the population. After doing a lot of reading it seems as the common denominator is feeding. If you have a way to get your fish out and stop feeding the tank for a long period of time seems like the key. I haven't lost any coral but I have to keep a eye on my nitrates as I have really good filtration and without feeding they can get low. I'm starting to have hope now. I actually bought a used tank to setup and very slowly transfer a little rock at a time and glue every one of the Snails shut. I understand I will not get 100% of them but that mixed with the no feeding just might work.