Generally Angels need a well oxygenated environment.
As temp get cooler, there are more dissolved oxygen available.
Try not to have the temp going beyond 29. The exception will be for those deep water angels(rarer type) which need colder water.
Most or all Philippines and Indo shipment Angels will be fine.
Also, take note of salinity as well. the higher it is. the less oxygen is available too.
If you don't use a ATO for top up. the salinity may raise if you forgot to top up fresh water.
Happy reefing!!!