you can get the marine dosers, or eheim has one. neither is cheap
you can get the marine dosers, or eheim has one. neither is cheap
you can check out the plantedtank forum's DIY section. i believe there are threads on DIY ones. i doubt you can get cheap autodoers here. minimum expenditure would be $100+ for 2 types of liquids
You can try using a dextrose dripper which you can purchase from any pharmacy supplies.
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