I've got a Tidal 110 on the way. Will give it a shot. I suppose I'll get it running and then start eliminating a sponge a week or something. Seems a shame to "waste" all these cycled sponges. I suppose I'll probably leave one in either way.
Thanks for pushing me over the edge and I'm pretty comfortable with HOBs as I've always had them. My oscar tanks always had Penguins years ago, I think I had two 450s on my 75 back then. I always liked those, but I've read nothing but bad stuff about them since.