Black Open Cell Foam for TL port Mouths?

[Rothchild]

The actual foam material you need is called RETICULATED FOAM. It likely comes under several Trade Names.

Thanks Toppsy, that's really handy - yup that's exactly the stuff.

This looks like a deal: https://www.amazon.com/Aquarium-Bioc...ticulated+Foam

Fish tank foam, whoda thunk it?!