Help and advice please.

Hello



I am new to these news groups so sorry if posted in wrong group.



I have got 2 tanks 1 tropical and 1 coldwater.



I have got the same filter products in the two tanks and I use TetraAqua
EasyBalance, Aquarium Pharmaceuticals Stress Zyme and there Stress Coat. My
tropical tank stays nice and clean but the coldwater does not am I doing
anything wrong and also are there any other treatments that I should be
putting into the tanks?



Also when I am replacing the water I tend to do it using a 2-litre jug and I
put the treatments into each individual 2-litre jug. Do I have to do this or
can I put the treatment into the tanks before and then just add the water?



Thanks in advance for your help and advice,



Regards Bongo.