How are you testing the levels you state in your post? Test kit?
Hi.Thank you for your help.I dont use tests for potassium.I have jbl test for po4 (liquid). Test kit api (liquid), permanent co2 test and ph computer which is used only to show ph.
I thought it is potassium but it seems to be impossible.
My tank holds 145 litre of water...minus 30 litres (substrate, stones, bogwood) plus filters 10 l. It gives me approximately 125 litre of water ''netto''.
I change water every week. 30 litres (25%) Mixing Ro with equilibrium seachem gh.
Seachem consists of 23% potassium. Due to seachem support website rising my gh by 1 gh would increase potassium by 13.5 ppm.
My water prepared for change has gh 7 ( 30 litres with K at 95ppm,( 7*13,5ppm= 95 ppm)) After water change (which in this case is 25%) Potassium in my tank should rise to 23.75 ppm. 95ppm / 25%= 23.75ppm
So every week (for the last 6 months) i was dosing 23.75 ppm of potassium from equilibrium
After spotting holes I also bought seachem potassium and was dosing 10 ppm per week .It didnt help.
I dose kno3 which daily gives my 1.5ppm of N and 1ppm of K.... I also dose phosphor but there is little K in it.
All together I provide about 30 - 40 ppm of potassium weekly. Recommended level of potassium in aquarium is 10-20 ppm. I think I have enough.
Mayby I overdosed potassium and the problem is calcium?
Few weeks ago I changed 50% of water trying to reduced dissolved organic carbon and excess of build up fertilisers.
I tried ready made JBL PROFLORA fertilisers but it only encouraged algae to grow. Now it is about 3 months since I saw first holes on leafs.Plants gradually melting, they have holes and weak stems.Now it is rather very fast process.