What powerheads wont kill a nudibranch?

[entice59]

i want to get a lettuce nudibranch but i dont know what powerhead i should get, the only one i know that one kill a slug is a rio and ive heard crap reviews.
Theres also the possibility of me adding a sponge around the powerhead, does anyone know what kind of sponge i should use and what i can use to secure it? Can i even keep a rubberband in the tank?
Ehiem has a new powerhead, the aquaball, but i dont know if it will suck it up, same thing with Jbj.
I am interested in ehiem and jbj's powerheads because the ehiem has those attachments for it and jbj because it shoots in two different directions rather then a standard powerhead which only shoots one direction(so i wont have to buy two powerheads)
If you guys got any good ideas for just fixing up my aquaclears i am open for suggestions. This is for my 15 gallon tank, basically 20 gallon but not as high.
Thanks a lot

 

[sebae0]

someone on here says that he sticks a bioball up to intake of the powerhead and its works fine as far as nothing getting stuck to it. i know they sell a kit for the hagens that has a lond plastic case with a sponge in it that mounts to the powerhead.