Just noticed the tank temp is 24C. I'd increase that to 26 or 27 (slowly over a few days ideally). Over the summer, the room temp will rise a lot, and your tank will hit higher temps without fans/chiller to stop it. Having the normal temp higher, means a smaller variation, and this is key for marines. A swing of more than a couple of degrees (even that is a lot), is a big problem for some fish, but certainly for a lot of corals.