I just bleached my 29 gallon and all its gravel, rocks, and decor.They looks so pretty and clean now!
I used about 1 part bleach(clorox) to 10 parts water. I might go a little less though for cleaning, like 15 or 20 to one.
My objective was to kill everything.I had blue/green algae, and wasn't going to spend the 14 bucks for medicine that my LFS wanted to charge me. Besides..I know it is dead now.
I rinsed it very well, then scrubbed a tad(bleach kinda makes everything come right off), then rinsed until it wasn't "slick" and didn't smell like bleach. Bleach will leave a slippery feeling on your fingers.
I didn't , but you may want to use gloves. It even took the lime away from the top. I let it soak for about 20 minutes or so.
Just make sure you rinse well.