New reef tank doing great - Nano struggling in the heat

Well I always thought that the level of T8s in the tank would be a
problem and I'm certainly being proved right.....the corals are very
unhappy - the blue legged hermits, clown fish, urchins, snails do not
seem to care in the slightest....

So.....I'm working on equalising the water between my new 350L tank and
the nano....mainly by using the water from the big tank for water
changes on the small.....in this way I am anticipating that moving the
corals across will be very easy and acclimitization at a minimum.....

But I don't want to tear down the little nano tank completely (15 gall)
- so I am wondering if the blue leg hermits and the Clown fish will cope
with the higher temps - it is pretty obvious that the corals
can't.....moving the fish is certainly an option but the blue legs
probably not as I have been told they would kill my red legs....

Any ideas or thoughts would be appreciated

TIA
Gill