Backyard Aquaponics
A place to discuss aquaponics

Hello i've got a little problem.
My fish (tilapia and carp) stops eating since some weeks.
The water readings has no ammonia, nitrite and nitrate.
Ph is 6,25 - 6,5.
I also stops feeding, added 0,15% salt for over a week.
Day before yesterday i removed all fish, bath them for 30 mins in 15g/l.
Cleaned the tank, changed all water in tank, but till today nothing changed yet.

I've a air pump with 10lph and four airstones in 1000L Tank.
The both growbeds will be flooded as ebb/flow all day 30mins on, 30 mins off.
So i think i've enough flow with two 2000lph pumps.
Also i decided to use a small wavemaster in the tank, nothing will help.

I tried looking for any worms, bacteria or infection on fish, but don't find it.
Using an uvc lamp for over a week, but the same prob.

Water temp between 20 and 30°C.
Has anyone a good idea?
Weather over the time isn't possible.


Dom

Well for starters, Stop Playing with the System. Removing fish and bathing them in salt just because they are not eating is silly, and is definately not going to make them want to eat more. UV lamps have absolutely no place in aquaponics either. You dont want to be killing any bacteria, it's all there for a reason.

We need a full set of readings from today, inluding your min and max temps. You have probably caused quite a bit of damage to your bacteria by replacing all your water and cleaning the tank. It's not an aquarium.

Good luck.

Actually readings is
ph 6,5
no2 0
no3 0
nh3/4 < 0,02

Temp min 22
Temp max 29

The reason for salting was that i thought they got ill.

Has anyone a idea why my fish stops eating?

The only thing I can see wrong with those readings is the relatively large temperature fluctuations, has your weather been changing seasons since they stopped feeding? Generaly anything between 5 and 10 degree differences in 24 hours will cause some issues, over 10 degrees can cause deaths.

Fish will also go off the bite due to barometric pressure drop....