[oldsaint]

I realize you've already done this but here's an easier way to measure the dose. Especially if you don't have access to a scale that measures below a gram.

Interceptor Solution:
Dissolve 1 tablet, 1gram, into 1 liter (1000 milliliters) of tank water. This makes the concentration 1 mg per 1 ml. Shake well before use and measure precisely

The dosage for the tank is 25mg per 10 gals of total system water.
Example:
200 gal system / 10=20 units
20x25mg = 500mg
500mg = 500 ml of interceptor solution

I am not sure that the solution is good long term so discard any leftovers.

Follow directions for the duration of treatment and removal instructions in the thread posted by Dustion on reefs.org