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Oh drat! Then why am I dosing 6g of potassium phosphate and 60g of potassium sulphate? Brill, I'll add some Ca. The rotalabutterfly calculator suggests I add 23g of CaSO4, which will give 15ppm of Calcium and raise the GH by 2dkh. This seems like a lot to me? I'll also add some potassium...

Thanks both for the advice! I've used the rotalabutterfly link to calculate my dosing - so easy! I think I may switch to dry dosing actually - measure doses into little pots - will be so much easier. Ian, I switched to RO water years ago after I started having issues with livestock, and this...

Hi all It's been a really long time since I posted here - I've been out of the hobby for a good few years. It's so good to be back :) I was lucky enough to pick up a display model Aqua Oak 450l systemised tank and cabinet with a damaged tank, so they replaced the tank with an opti-white...

Dennerle do a similar kind of calcium product for shrimp, although I'm not sure how economical it works out. Off the top of my head, it's 5 drops per 20liters - I've been using 5 drops in my 20 liter ever week, and I would say I've used half a bottle in about 6 months. I use RO water and I've...