I have a 400 gallon system, 250 display 40g fuge,30g frag, 100g sump. My system is all tied into the same sump. I noticed only in my frag tank red bugs. I know I got them from this one piece of rock I added from a sady sorce. I got interceptor for large dogs and croshed it into a powder and mixed it with heated seawater. I added it to the system when lights where off and I shut down the air into my skimer keeping water flowing thu it. I also shut down all reators. I waited till the next day 12hours and noticed a lot where gone but not all. I spoke to a fellow RC member and he told me add two more tablets, so I did. I lost most of my hermits ,crabs and shrimp

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I re inspected my frag tank and see them still clinging to life! ***. I wait another 4 dayswithout doing a water change, I do a waterchange and dump all the water in the reactors and run full carbon. Skimmer is now back on line. I wait another day and still see bugs, so guess what I add anothe 2 tablets and nothing. I think the bugs like this stuff. Today 8 am I go to inspect my frag tank and see more bugs then ever. Guess what I remove all live stock (snails& fish ) and move them into a quarentine system thats 100% stand alone. and shut the flow thru the frag tank and pump all the water out till the tank is dry. I left the rock in the empty tank becuase I just cant trust it. I will leave this system dry for a good few days. If that doesnt kill them I give up.