[Delphinus]

Eggcrate may in fact be worse than nothing at all. If you think about how a snake moves (assuming eels will be similar), they can move a lot faster through narrow openings than a wide open area because they propel themselves using side-to-side movements and if there's something lateral to push against, the result is a stronger thrust forward. Just speculatin' anyhow..

I can see that Eurobracing may help though as if they're following the glass up, they have to arch back to get over that. I can see them not following-through and just turning around and swimming somewhere else. Again, just speculatin' though.

Last but not least I think if the rockwork is low it may also help because at least with mine, he is *never* out in the open - never more than a few inches away from the rockwork. It makes sense, at this size they are "food" to a lot of things so being out in the open instead of near a "safe den" is probably not something they want to do a lot of. This is my hope anyhow.