SMB are OK with warmer water, they just have slightly higher dissolved oxygen requirements than other fish and can get in trouble sooner if DO levels start to sag suddenly.
When my bloom died back due to weather changes recently a dozen of my SMB got very stressed, I also had lots of my larger GSH piping on the surface and one single yellow perch. Interesting that I never did see a single RES piping at the surface. I did end up with 8 SMB morts in the 14" to 18" range, 3 GSH in the 6 to 7" range, and that one 11" YP.
