Is this the correct QT for inverts/corals?

[Aronsaquarium]

Hey!
Is this the recommended inverts/coral QT requirements?
I’m using a 10g fully established QT for my inverts. Temperature is 78 Fahrenheit.

I tried putting a starfish in it and that didn’t last long.. so I want to be able to put them into my DT straight away as that seems to be much better, which according to this graph is totally fine after a rinse.
(Regular starfish as well as sand sifting stars.)

 

[Aronsaquarium]

As a follow up:

Does this apply if I’m pretty sure there was ich in the tank?
I had a couple clowns in there until a few weeks ago, they’re now being treated in another tank and this 10g will now be inverts only QT.