Have a water volume of about 35 to 40 gallons split between a 20g sump a 13.5g fluval and a 16g rimless. Noticed my clam was no happy and checked my alkalinity with API test and it is reading stupid low after 2 tests. Any ideas what would be the best way to keep alkalinity stable in a smaller system long term? I could purchase a dosing pump but finding one that would dose 2ml of solution or less a day is proving difficult. I am curious to hear what everyone's solutions are.