Soo... I an starting a new tank and had some rock sitting outside for over a year in a bucket (back porch was covered but still "outside". Naturally I want to reuse this rock because it is expensive. After soaking in a chlorine/water bath with power headfor 24 hours I noticed a jelly like substance on a few pieces. I think this is just dead organics that bleached.( I was able to easily hose them off once I laid them out on the ground. Just wanted too see if anyone else has seen this. I am soaking them in a new vat of water now with prime to make sure the chlorine goes bye bye. Next step it to start curing this rock for my tank cycle.