When I used the medication I just tried my best to estimate the actual water volume...I am sure I was not 100% accurate but close enough. I didn't have to weigh the med as I just added 1 pill for my estimated 400g water volume.
Just follow the .05g/20g rule and you should be fine, just try to be as accurate as possible.
I dissolved the powder in a bowl of water each time before I added it to make sure it dissolved as much as possible. I added it to a very high flow area in my sump.
At MY OWN risk , I double/triple the dosage when quarantining (10 g tank) new additons (all corals not just frags) . I leave them in the Q for the full seven hours with no effects to the corals/clams I have added a few different types of coral frags and a clam since the treatments began ...I don't think accuracy here is as much of an issue (in my experience) as I am not messing around with my whole system...If I was treating a 10g display on the other hand I would just take the effort to find the more accurate scale...
Just follow the .05g/20g rule and you should be fine, just try to be as accurate as possible.
I dissolved the powder in a bowl of water each time before I added it to make sure it dissolved as much as possible. I added it to a very high flow area in my sump.
At MY OWN risk , I double/triple the dosage when quarantining (10 g tank) new additons (all corals not just frags) . I leave them in the Q for the full seven hours with no effects to the corals/clams I have added a few different types of coral frags and a clam since the treatments began ...I don't think accuracy here is as much of an issue (in my experience) as I am not messing around with my whole system...If I was treating a 10g display on the other hand I would just take the effort to find the more accurate scale...