Hi everyone
Thanks again for your replies.
Last night I put a danio out of its misery.
I put a 6" long airstone under the gravel and sped up the air flow, this morning the water was clearer and all fish still alive, the danios favouring the bottom on the gravel.
I did an ammo test, it was between .25 to .5. I took a sample of water from both tanks and went to the LPS to test. He said all readings were in the acceptable range, however said that the ammo can spike. He suggested a 1/3 water change and again Friday or Saturday.
I decided to take out the platys and swordtails and put them in my big tank.
Got home tonight and the danios are at the top of the tank swimming a little bit better, there is one platy with them as I couldn't catch him this morning.
The others in the big tank are very happy and so am I.
One question what is IMHO??? :-?