For me it was when the expense of adding two part Calc/alk on a bigger tank justified a calcium reactor. Also being to able to go on vacation without someone having to dose the tank.
There are DIY recipes for 2 part that would bring the cost down and dosers that would automate it.
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Brian
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220g inwall 48"x36"x30"
110g mangrove refug/sump
Poison Dart Frog Vivarium
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