As the title says.
I have a 90l (23.75USG) actual water volume Juwel tank running with pressurised CO2 (green drop tester with home-made 4dKH water) and two 18W T8 light tubes. My water comes out of the tap at about 25ppm nitrate, and I have a high fish-load, so I do not want to add extra nitrate (end-of-week test levels for nitrate are always between 25 and 50ppm). Without suppliments, my phosphate levels always test out at 0ppm (uncalibrated Salifert test kit) - dosing Flourish Phosphate to give 1ppm tests as 1ppm using this kit, so I have some confidence in this testing.
I have read the guidance on here that for low light, reduce the dosing to twice a week from three times. Ok so far.
The EI tables for a 20 - 40USG tank say add 1/16tsp KH2PO4. Ok with this too.
What do I do to get the K levels up where they should be however? I'm guessing that I need to add K2SO4, but how much? Should I add 1/4tsp K2SO4 in place of the recommended KNO3 dose?
Peter
I have a 90l (23.75USG) actual water volume Juwel tank running with pressurised CO2 (green drop tester with home-made 4dKH water) and two 18W T8 light tubes. My water comes out of the tap at about 25ppm nitrate, and I have a high fish-load, so I do not want to add extra nitrate (end-of-week test levels for nitrate are always between 25 and 50ppm). Without suppliments, my phosphate levels always test out at 0ppm (uncalibrated Salifert test kit) - dosing Flourish Phosphate to give 1ppm tests as 1ppm using this kit, so I have some confidence in this testing.
I have read the guidance on here that for low light, reduce the dosing to twice a week from three times. Ok so far.
The EI tables for a 20 - 40USG tank say add 1/16tsp KH2PO4. Ok with this too.
What do I do to get the K levels up where they should be however? I'm guessing that I need to add K2SO4, but how much? Should I add 1/4tsp K2SO4 in place of the recommended KNO3 dose?
Peter