New to coral.

I have a 55ga tank I started with live rock and fish only for about 5 months I added three corals last friday a leather toadstool, disk coral and hammer coral. how can I tell if they are happy the toadstool will stand up realy big then it will just kind of leans over then it will stand up big again is the normal?
How do I know if I have good water flow or to much?
I changed my power heads last night from three 230GPH to two 400GPH and I'm wondering if I should of just left it alone, because I got up this morning and the disk and the hammer coral was closed up and the toadstool was leaned over, but I guess this could be from only the LED lights on and not the T-5 on yet.
Also my temps at 80 steady all the time is this ok or is it to high?
Thanks
 
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