Join Date: Mar 2020
Location: Seacoast New Hampshire
I am also pretty new to planted tanks but thought I'd add my thoughts as I encountered the same thing when I added plants. I ordered plants online and some of them must have had snail eggs or little hitchhikers because I ended up with several bladder snails!
They've been in my tank for several months now and there population has stayed under control. I have some in with sparkling gouramis and espei rasboras and I have only seen a few baby snails in the month since I added the fish, even though I've seen quite a few eggs. I think the sparkling gouramis may be eating the newly hatched snails - I think I read that they do this. I'm not sure if Bettas or Dwarf Gouramis eat them too.
I also have some in with ember tetras and that population is definitely growing faster, but I've probably been overfeeding slightly. I've found them to be great for controlling algae in both tanks.
Like the others have said, the population will likely balance itself out. I've found them beneficial in my tanks. A potential issue that I see with getting an assassin snail would be that it would run out food pretty quickly and then you'd either have to get more snails to feed it or rehome it. I think you'd want to have quite a few more snails already in the tank before it would be worth getting an assassin snail to reduce the population.