My gravel vac siphon is bent to the point where it gets to be annoying when I'm doing water changes/gravel vacuuming. It slows the flow of the water and I have to keep fixing it.. Problem is, this is my third one. I don't know why they keep getting bent like that? The first time or two I thought I was just not storing them properly, but I've been really careful with the third one. Where can I find less flimsy siphons? These ones are really thin too.