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Higher ph definitely helps with growth. When I ran the reactor before my ph was 8.2 to 8.1 with kalkwasser. I'm going to try it without the stirrer and see how it goes. If it drops below 8 during the day I'm going to but it back on.
Cant beat black box led for the price they range from $80 to $130. I have viparspectra leds got them off ebay for $100. They work very well nothing fancy but get the job done. They have a built in controller so you dont need to hook them up to your reef keeper.
I am getting ready to put my calcium reactor back on my tank. I've been thinking about taking my kalk stirrer off when I do. I ran them both at the same time when I had the reactor on before and it worked well. But I think it will be nice not to have to maintain the kalk stirrer anymore. Just...