quick google search says leaf zone provides Fe and K. You are likely low on the other two macros: N, P. Your tank sounds super low tech so dosing a bit of dry ferts like KNO3, KH2PO4, K2SO4 will probably have you covered. Iron / micros I wouldn't even worry about given your plant selection. Can't hurt though.
Again, given your plant selection you should only need to dose a little bit.
Generally you should use dry ferts. Liquid ferts are a waste of $$$ IMO. Just make your own solution or dose dry.
Again, given your plant selection you should only need to dose a little bit.
Generally you should use dry ferts. Liquid ferts are a waste of $$$ IMO. Just make your own solution or dose dry.