- Jul 4, 2020
- Reaction score
I’m wondering where you came up with that 8.4 number. That’s oddly specific. I keep my alk below 8 and grow more coralline than my urchins can eat. So I’m curious about where that number came from.If they are purple or pink, then yep. If you want it to grow keep your alkalinity above 8.4dKH balanced with calcium and keep the flow medium to high.