NH4 / NH3 for shrimp tank
 

Hi ,

need some help on this issue.
i have set up two 1 ft CRS tank .
First tank is over 2 years and stable ( PH 5.5) , shrimps breed and grow well.
Second tank set up about 2 months back , ( PH 5.5) , shrimps didn't do well and some died.

water change for both tanks are 10% weekly.
However , i realised that the NH4/NH3 test for first tank is level 8 !! and second tank is level 0 .

Am i right to say that tank 1 is full of ammonia which is bad for shrimps but how come they still doing well ??

Thanks

You sure it's not the other way around?

very sure shrimps doing well in level 8 !! Test kit shown dark green !!

A matured tank normally zero ammonia as bb well established.