If I lay a typical 1/2 ton truck tire on the bottom it will be about 10 or 11" up in the air. If I have the tire 3/4 full of gravel or so, will the bluegill still use that as a spawning bed or do they want the bed mostly BELOW grade of the surrounding pond?

I worked hard to try to seal the bottom of my pond, I don't look forward to digging holes in it just to help the bluegill out and bury tires smile