Leaving a hose on all night would be courting disaster Nepen , did you do anything about ridding the water of Chlorine and chloramines before it left the bog to run into the pond ?Thanks all.
Lisa, I like to read other people's problem too so I can prepare and not panic!
TM, I'll keep my eyes out for them. this is really weird and I still couldn't pin point the cause. It might be that the water change helped some how, but I couldn't tell what was the problem since when I tested the water was ok.
Dave, yes the water just came out from the hose. I thought about that a bit but the water from the hose was a tad warmer but I put it in the bog and let it flow out with the water that come from the bog and splashed to the pond water. I opened just half the water so it wasn't full strength, still not trickle method though I did it in the evening so I dont want to take too long and not wanting to leave the hose running the whole night. But next time I'll try the trickle method.
I have 3 places where water splashed to the pond. but I'll put air pump in just to see. I thought that the oxygen depleted in hot weather only?
Always try to match your temperatures as closely as you can, you can buy infra-red hand held thermometers quite cheaply nowadays .
How are they all now , did the garlic work or haven't you tried it of yet ?
Dave