Well, here's what i found with bryopsis. First time i was carbon dosing and had gfo online when i dosed tech m, melted away. Second time i dosed tech m in this tank, no carbon dosing or gfo, nothing happened, added 2 gallons. Started dosing vodka and put gfo back online for about a month to see if that would kill it by itself, i saw it struggling, but not dying. Added one more gallon of tech m while dosing vodka and using gfo, melted away again in a weeks time. I'll get another picture up tonight, the one above i had just started dosing the gallon of tech m.