I have never added pods to my tank. A year and a half old now and I still pull the odd pod out of my sock. My mandarin and pipefish only eat pods so there seems to be a self sustaining population.
A cheaper way of adding planktonic life to your tank is to buy a bunch of shrimp. I have 4 skunk cleaners, two fire shrimp, 3 peppermints, 4 sexy shrimp and 3 pom pomp crabs. All of them reproduce on a regular basis and pollute my tank with yummy larvae.
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