I have two tanks in the one system, both with silver perch in.
Up until about a week ago, both lots of silver perch were eating fine. Now the 14 silver perch in the smaller tank (600L) have not touched food for almost a week, while the 30 silver perch in the 1000L tank are chowing down like its their last meal.
The water flows from 1000L tank to 1200L of GB to 600L tank then back to 1000L tank. 1000L tank will have vol changed twice an hour, so 600L tank is having its water changed 3-4 time per hour (via SLO).
Water temps have risen lately to high teens, ph 6.8, 0 Ammonia, 0 Nitrates about 100ppm Nitrates.
Seems odd that one lot can go off the feed while the other have not. Any ideas? The ones of the feed are more mature larger fish so I thought perhaps spawning development (even though they wont in the tank) may be a factor?
I'm not overly concerned, though a little intrigued
There are no signs of any disease on the fish and they are actively cruising around the tank and will rise to food when it first goes in the tank, but not eat it.
