Overflow keeps clogging with colonista snails. Solutions?

[SamMule]

Just as the title states. My overflow pipe caps keep clogging with colonista snails, causing it to gurgle. Its not a huge issue, but the caps are PITA to get off and clean. If I was to remove the main drain cap, does anyone see any issue with it?
My other thought was to put a u-shaped cap on it. I can clean the gate valve pretty easily via opening it further down and allowing anything else to flush out.
Thoughts?

Main drain.

Emergency overflow

 

[Arthacker87]

Grab them by the throat and punch them? Na to be honest notnsure there is one. Throat or solution.

 

[bobnicaragua]

Those caps are a pain. Try pulling it off and drilling the upper part of the main drain PVC pipe full of holes.

 

[Rocks reef]

Can you put foam around it? Like the 'cylinder' foam pieces they use on return pumps, etc

 

[SamMule]

Can you put foam around it? Like the 'cylinder' foam pieces they use on return pumps, etc

Hey, thats a good idea. Would be much easier to clean anyway