I had a star fish crawl up through the return (against the flow) and down 6ft of PVC into the return pump. The flow was way off with the sound of the pump working extra hard. I initially thought snail or possible cheato clump. Low and behold it was my Linckia Star. Luckily the outlet on my return is clear so I could see what was causing the issue. After turning everything off and removing the pump I finally pried it out, no major damage other than a few scratches.
wow. I feel like that's a pretty extreme way of saying "hey! I want more flow!"