not staghorn snails.. staghorn algae. I read there's almost no way to get rid of these except by manually removing them. Lazy lah. I also read rosy barbs eat thread algae... thought maybe they eat these staghorn too. This staghorn is like a disease lah, whatever parameters also can grow, but their growth rate mainly depend on availability of light it seems. Once infected have to tear down the tank and sterilize everything. Lazy lah. Somemore glossoes growing nicely :/