No on both.aquaman5000;2600282; said:venting and puting a check valve in sounds like a ticket
Venting it the way you described will make it worse. Secondly that is what you already did with the first one. Adding a second one won't help or solve the problem.
I am clueless how you came up with a check valve, but either type won't do anything. I don't know which type you were talking about but a check valve only controls the direction of flow. That isn't an issue here so....
Replace either of the 90's with a tee. If you are worried about a small fish from getting sucked in, glue on a piece of screen to the open end.






