wrasse wrote:So is it ich or oodinium, or something else?
It always concerns me with ich and particularly oodinium that the actual cause was something else. An example from way back when was a guy who ran a big 6x2x2 and used to come in the shop from time to time to buy kit/food and sometimes fish but it was mostly a stable tank. Over a period of about 2 years, he had 3 wipe outs in the same tank. Some fish got sick, then the whole lot went usually. Eventually we tracked this down to the fact that he was working on his car (like really working on it, not giving it a wash!) and then cleaned his hands of grease with something that stayed on his skin for at least 12 hours and if he went into the tank in that time it caused this. It took 3 wipe outs to cause this pattern to be seen, as you always worry about more related things like adding new fish, water changes and so on.
I only do water changes of 1/3 of the fishroom for this very reason. If there is something wrong with the new water, I am only affecting 33% of my tanks. Assuming it takes less than 3 days to show (roughly my water change regime is 33% of 33% every (around 1200 litres) three days.
So, I am not saying it's a water change, and I don't think it's something specific. But are there any patterns here Marc?
Jools