Don't worry about suction cup slime- just wipe it off. All of mine get slimy.
I recently put a cute little ship in my Peanut's tank and now he's barely alive. I'm hoping he pulls out of it. It's a small decoration that looks like a shipwreck with little sharks painted on. It's supposed to be a bubbler but I just used it as a decoration for obvious reasons. Peanut loved that stupid thing- after the first day he wasn't looking quite right, one and a half days later he was clamped and near the surface all day, panting. AVOID!
Here's a link to the shipwreck: