My tank is currently at 24C, a friend with a tank said it should be
around 21-22C only??

24c is 75f, I run my tanks about 77 - 78 f. I don't think your friend
has good information. However, check your LFS or check web sites that

Depends on the fish. My tanks range from 65-59 degrees (18-21C).

If the fish are fine and happy at the current temperature it's fine.

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