All, after a vacation at the Frio river last weekend I collected a bunch of neat looking medium size river rocks from the Frio river. All of these rocks were collected from the river bed, not the surrounding dirt, etc. I placed them outside for 3 days to "cook" in the sun, I then soaked them in a 50% bleach solution for 1 day. I then scrubbed them, cleaned them, soaked them in a few normal baths of H20 and Chlorine remover. I am then going to "cook" them outside in the sun for another few days. Once done, can I safely place these in my freshwater tank? This tank is nothing spiffy, just houses some tetras, plecos, ruby noses, etc. My son though loves the rocks and wants to add them as decoration?

Any thoughts or concerns?