I use half rusty tongs, and if I cut a coral half rusty bone cutters.. Stick my hands in my tank at least twice a day until I get some Damn glue.. My tank should be a swamp the way I stick my hands in there if that really meant anything.. I could probably go in my tank with no ill reactions on the system and it's inhabitants,,lol.. My fish have eaten brocolli with butter on it with no ill reactions and all types of crazy not on mreef menu type of meals.. If I had a small tank that would probably change everything.. If your system is weakened by unstable pars, a small skimmer, high trates, and phates you should definetly be cautious..
The statements above are the views and opinions of someone who has never experienced a tank crash so you might not want to try these things,,,,lmao..