New Clownfish strange behaviour

Hi All,

So on Tuesday I added two Ocellaris Clowns to my 8 week old tank and they seem to have been fine with the lights off and they started eating small amounts of Mysis yesterday.

I was feeding them this morning and they both seemed to be eating a little and then when I was done I turned the powerhead back on and turned the lights on low (to start getting them used to it) and one of them dived for the bottom of the Tank and layed on his side and started breathing heavy and the other swam around doing loops and going nuts for a brief period then went back to normal. Unfortunately I had to leave for work so just left them to it, what do you think is up? Do you think I just startled them?

They have both been quite jumpy all week, I slammed a door yesterday by accident and they both shot behind the rock and didnt come out for 20 mins.

Do you think they are both just stressed from the new environment? (it has only been 3 days).

Just looking for some expert advice as I am fairly new to this!

Tank was last tested on Weds with results as follows:

Salinity 1.0245
Amm 0
Nitrites 0
Nitrates 5-10
PH 8
Alk 7
Oxygen 10

Thanks in advance for any advice!