another thing is if you have and air pump going for the tank it can push the spray into the water pretty fast
Yes I know that would also do that... I don't have an air pump in this tank. only the spray bar.
I always spray all sorts of chemicals near my open top tanks, nothing ever dies from it...
maybe you have been lucky who knows...
this is absolutely horrible. so sorry for your loss.
Also On my comment of trying the Cardinals........ Forget it... Man those things are Pre-Madonas... lol