in your experience when dosing metro directly to a QT does it effect the biological? Trying to cover all my bases in terms of brook and uromena but don't want to destroy by biological.... any thoughts?It can if the feeding process is messy. Feeding small amounts, siphoning out (turkey baster works great) the uneaten bits usually works really well. Prazi won't bother much and the small amount of metro, if mostly removed is no problem. Very commonly medicated food used in reef tanks.