Wow what a read - 3 nights

Even had some relevant bits in there worth saving
So here is something I believe relevant. I have 30 barra that started 15cm about 6 weeks ago. From the amount of food they have eaten they would probably be 15.1cm now...
We had weeks of cool weather and water temps 15 ish. Then weeks of warmer where I got 25 day and 18 morning.
The last few days of cold and rain - Im seeing 12C at 4pm
Yet no dead ones that I can see.
I have put in a 600W heater to run all night tonight, and minimizing the night water turnover as I know this is just ridiculous.
By everything I have read - shouldn't they all be swimming upside down or not at all???
Am i just incredibly lucky, or do I have 30 dead sinkers in the back corner that I cant see
