Hi everyone !
i think i understand what happen last week. 2 days after i fill the tank, they drank so much,, and EC increase a lot. so i removed 7/8 L in each tank and fill it again with tap water to decrease EC to 1.2/1.3. i don't see more damage after diluate so i guess they like it 😅
i change the water today, and i feed them less than last week ( 30-40% of the recommended quantity )
See you next week 👋