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Mark at UC told me about this a while ago. I hope it’s accurate and reliable, cause I want one!!
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On the kalk, I found mixing and dosing to be a pain. It really helped my tank stability, so I moved to a stirrer. It’s a world of difference, cleaner and easier. You can use a timer or controller to manage the pump, and you’ll only have to refill it every few weeks or so.
Good luck!
I'm in Chicago for business at the moment. I'll get you a couple pics when I get home. Can you please remind me on Thursday if I forget? It's going to be a bit of a brain drain here....
They are delicate-ish, which is fine because they're inexpensive. You'll have a couple that make it long term, while replacing others in 3-6 months. I put 10-15 at a time in my 50 gallon frag tanks. They are a great clean up crew, but can get munched pretty easily, especially while molting...