Oh hey I see you are a brand new member. Welcome and they like you to post some things about yourself in the introduction thread first so we can give you a proper welcome
I put some on tile, it pealed off, so I would test it on a few rocks to see how well it holds up. Rocks have a lot of texture, they would probably do fine with a gloss sealant.
Grout sealer works .I buy the spray can it is easier .It is also food safe ,so I'm guessing fish safe .I found that out when I put my glass back splash up in my kitchen and I will have to take a pic of the rocks .That was over a year ago .
Try tile sealer called 501, you can find them in tile section in Home Depot, once it dry up it will bring out the hidden color of rocks, I had it on my granite paving stones of my patio for a few years and they still look new.
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