You have 5 to 6 experienced Reefers, telling you everything is fine in the other thread...
pH Spike: The initial spike from 8.23 to 8.93 was due to the sudden addition of the alkalinity supplement, which can temporarily raise pH. The subsequent drop to 8.36 is likely because your tank's buffering capacity and natural processes (like CO2 exchange with the air) brought it back down.
Alkalinity Impact: Adding the entire 50ml dose at once likely caused a significant increase in alkalinity. This can stress corals and other sensitive organisms, especially if the alkalinity level rose too quickly. However, if your pH has stabilized at 8.36, it suggests the system is recovering.
What to Do Now:
- Monitor pH and Alkalinity: Keep an eye on both parameters over the next few days to ensure they stabilize.
- Observe Livestock: Watch for signs of stress in your corals, fish, and other inhabitants. If you notice any issues (e.g., coral bleaching, fish gasping), take steps to stabilize the tank further.
- Avoid Further Adjustments: Let the tank stabilize naturally. Avoid adding more supplements unless absolutely necessary.
Prevention: In the future, always dose alkalinity supplements slowly and in smaller increments, especially in a large tank like yours. This helps avoid sudden swings in pH and alkalinity.
If your tank seems stable now and your livestock isn't showing signs of stress, you likely didn't cause any long-term harm. Just keep monitoring and take it slow with adjustments in the future!