I am not an expert on this so I will just give you some ideas. I think wooden Pallets may work as I put them in for FHM and the GSF took them over, now some of the smaller bass could possibly get into it but not sure if they would care to or not.

Also if you have weed cover or vegetation of some sort they hid in there, and the bass usually just hang out at the edge and wait rather than work hard to swim thru it to eat.

Are you trying to get crappie to survive?

I am sure if you have them and they spawn successfully you will have plenty that make it, the problem is that you may just have too many small ones that are not too interested in being hooked.

You may want to try to add some more brush piles that are more dense like Christmas Trees etc. Logs and such attract bass as well.

I wish I could be more help but I am also trying to figure out what I should or should not put in to make it easier for crappie to grow large yet not overpopulate.

I personally would prefer that they not spawn and just add some larger fish from other BOW's. I have yet to find a study that says if you do not add this, or plant that then Crappie will not spawn.

Maybe some others will be along to post there thoughts but most on here recommend not to even stock them as you run into all of these questions, concerns, unknowns ect.

I think it comes down to being able to handle your pond possibly being taken over and ruined by the crappie.

This is why I am considering adding some to a pond that really needs to be fixed but we do not have the money right now to do so.

If I can get some nice slabs out of it for say 2-5 years before it crashes maybe then I will have the money to drain and repair, then I can see if I have tons of small crappie all the same size or if they just died off.

I plan to post it on here if I follow through with it for those who are interested in watching a fellow PB'er slowing kill his pond.

LOL