There is no problem assuming you are mixing it correctly. You will also see a post at the bottom of how mine turns out. Sometimes the dosing container after 30 days will have a light gold/brown left over residue but it isn't anything to worry about. It has been covered throughout several posts here and elsewhere.
I dose about 90 ml/day. Starting with the DIY recipe TM provided late 2019 and now using the powder. Personally speaking it is a great product.
See post below:
My all for reef powder has gone a bit hard and clumpy in the tub is it still ok to use? Also, there is always a fine powder left undissolved at the bottom when mixing it up, what is this?
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And here:
I'm mixing up the All-For-Reef powder into a solution. The directions say add 160g to 1L of water. However I know sometimes things can be translated poorly into English. With other products like Triton you would actually mix the powder into 750ml of water to start and then after displacement top...
www.reef2reef.com