The recommended Dose rates for Excel appear to be fine but caution is required if you intend over-dosing. I have known people who have killed their Discus through an Excel over-dose (3 x recommended dosage for algae cure) and another friend almost lost her Clown Loaches to an relatively mild dose of Excel. They were undertaking a water change, removed the water, dosed the Excel and topped-up the tank. Had they topped-up the tank first berfore dosing the Excel the loaches 'may have' suffered less. Obviously many people are experiencing wonderful algae cures using Excel but.... exercise caution.
take care
take care
