certainly not down to 3!
Thats stomach acid !
Sabbotage?
Childish pranks?
Can you track down to when the last class int hat lab used any acid? or anything? Was the water cloudy/coloured at all?
I have just set up another tank in the bio room .
Students brought in 3 bags of fish as a present for the teacher..straight from the pet shop.. but at 2.30 pm.
We had no warning, so you can imagine the flurry I had to try set up a whole bang aquarium at the end of the day. Scraping together spare gravel, rocks filters etc. Phew
Newbies are doing well.
I DO hope that you've managed to save a few at least.
Please give them a big kiss from me.
PS How often do you guys change the carbon in your filters?
I'm not sure