thanks for the info! i did get the AC 150 and am running it without carbon but am using 2 sponges. i have it going full blast and so far the only plants i have are about 5 nice bunches of vallisneria americana (natans). i haven't had any problem with them being uprooted or blowing around much. once i get my other plants in i'll keep your suggestion in mind allthingsanimal
in case i run into that problem.
thanks again, everyone!