substrate and or liquid ferts
understand each tank is different but for perspective are people using one or other or both? just got readings on my 5 established hitech planted tanks all dosed at same rate by volume and nitrates range from 5 to 60 ppm. phosphates range 3 to 10 ppm. been at growing planted tanks just over a year. plants do well and algae is very manageable- occassional spot treatments. had significant fish die-off in all tanks about 6 weeks ago. symptoms indicate dropsy- pop eye and swollen abdomens. just received two shipments of fish before fish began dying. was using substrate tabs every 30 days per 3" square area with ei dosing. 50% weekly water changes religiously. tanks are good by aquavisor bioload. is regular ei dosing and substrate ferts every 30 days common?