I have a Nuvo Fusion 20, how much 2part can I dose at once before it becomes a PH issue? I'm having to dose 5ml a day, wondering if I can do it at once or spread it out throughout the day? Same question with Magnesium dosing. Thanks.
Best is through the day, a doser would be the best, but your tank is really small, so idk if its worth it for consistency to you. For me yes. I would try and maybe break it up to morning then night, or whatever works for you. Remember you cant/shouldn't dose them together to avoid precipitation.
I wouldn't worry too much about ph being the issue. To be safe, test your alk prior to and then 20 min after test again and see how big of a jump it is. Also, check to see if you don't get precipitation by just dosing the alk all at once. Also, make sure to dose in a high flow area.
If you want the best consistency I would recommend purchasing a doser, as mentioned above. I understand that the higher-end dosers are out of budget for some, but there are cheaper options like this one, that I have used in the past and work fine. It will save you the troubles of manual dosing and possibly losing some more sensitive corals. Sometimes spending the money upfront will save you heartache of losing corals/money in the long run. Smaller tanks are prone to fluctuation because of the limited water volume, so just be extra careful. https://www.amazon.com/Jebao-Programmable-Auto-Dosing-DP-4/dp/B014KKCILE