hypnogogia
Member
Ok, so Ferropol is iron I think and then the NPK, so you are not adding any magnesium. Have a look at your water suppliers water report to see how much magnesium is in your tap water. If it’s low, you will need to add as a salt. Look for MgSO4 (Epsom salt). Be careful of looking for Epsom salts as some of the ones on places such as amazon have other additives for bath use. I use this https://www.aquariumplantfood.co.uk/fertilisers/magnesium-sulphate.htmlJBL Ferropol 40ml at water change and 20ml mid week in addition to the NPK