Ammonia is 0 on salifert test. It's at 1 on the API test. Water is mixing, will do a change in an hour or so.
The royal gramma came out 5 mins ago so it's just the clown and hawkfish.
I've had an issue with my skimmer, had a snail caught in the intake. I took it apart, cleaned it but it wouldn't stop over flowing, so I left the plug out and just let it run. It finally stopped last night. I do use filter socks and kept them on during this time. Checked the flow on the return pump, it was reduced, the intake was clogged with cheato, cleaned off and it's running fine.
Last water change was 2 weeks ago before I left on holidays. Tank was looked after while I was away, as the weather was cool, was not worried about the temps. Top ups done and fish were fed.
I'm not sure what I could have done or not done to cause these deaths
