so I just built a refugium/sump using aquarium silicone after waiting for like 2-3 days for it to cure, i started to fill in water, but noticed there's a small patch of pink colored silicone after I added some sand/live rock where I jointed the acrylics together...just to be safe, I wanted to run some carbons to make sure there's nothing in the water...question is, I reused some kent reef carbon which was used only like a day before, when I flush it under water, I can stilll hear sizzling sound, so does that mean the carbon is till good to use? I know I shouldn't reuse carbons, but in this case, they were only used once for like a day...is this sizzling sound a good test to see if the carbon is still good?