I keep mine at 24c which is about 75f. Not had any problems with growth or health of sps but more importantly don't need to panic when the temp raises a few degrees in the summer.
We had a really hot summer (well hot for england) and the temp shot upto 28c (82f) for a few weeks and I did need to dose a fair bit more, so the sweet spot for growth is on the upper end but you need to factor in if you can keep that temperature stable.
We had a really hot summer (well hot for england) and the temp shot upto 28c (82f) for a few weeks and I did need to dose a fair bit more, so the sweet spot for growth is on the upper end but you need to factor in if you can keep that temperature stable.