I have a fairly new (3 months) tank 60x30x30. Planted and all looks well.
Amonia and Nitrite are 0 ,Nitrate about 10 and PH of 8 (due to my wood leaking its dye I think - looks like weak tea but i like it!)
I have 6 long fined zebra danios and have had a worry with one for the last week.
In the...