Now super steady! I need to add way less water than last year (over half a liter a day then), because the eweather is just so cloudy. Just 20°C, max during the day, rarely above and not for long... But it doesn't prevent them to grow fast!
Lazarus is a baby that I had put in the filter tank in spring. He spent the autumn and winter in the living room with his bros after I found eggs by september. I thought they had disappeared but there he is! Or maybe it's a joke from a friend...
@goarilla, Thanks for the tip, it usually dries up (or gets absorbed) quite quickly, but I'll definitely pay lots of attention to it in the coming weeks. I'm even thinking to fit a transparent plastic bag over them if and when forecast seems too wet for too long.