why do my 2 new clownfish do this???

i got them 4 days ago.then spend most of the day in the front corner of the tank at the bottom but when i turn the lights off at night the come out and swim around the tank??

why do they do this?
i know there are still new to the tank.

also i never see them going to the surface for air?
is this normal as i thought they were suposed to.

 

firstly just wanted to say that i personally have never heard of clownfish "going up for air?"sometimes they sit around the top of tank but thats usually for food,lol

what other tank mates/anemones, if any ,do you have in there with them? also size of tank?

sounds to me that they are in new surroundings and feel safer browsing it at night.

 

its a 40 gallon there are only 2 cleaner shrimp in there with them.

 

ok,so im guessing theres rock etc in there,other wise i think they will be a bit lost! forgot to ask are they feeding ok and is it a new tank or old one?

 

yeah theres 20kgs live rock 40lbs live sand its a new tank yeah they are feeding well. hold up??? they have just come out of the corner to the centre of the tank lol this is the first time they have done this in the daytime.they stay together all the time.

 

My two clowns stuck to the top/front/left corner of my tank for quite a while after they were added. When they did finally start moving around, they would do it at night.

They eventually acclimated and all is well.

+1 on jeth's reply on the air.

 

Few fish breathe air. In fact, the only fish that I can think of that do this are freshwater bettas.

 

oh rite i didnt know that

 

they should indeed stay together most of the time(unless the male is not up to it and then she will kick him out,but this only happens with mating/egg rearing).
it does really sound like there unsure of there surroundings.
how old is the tank?,only asking as obviously they stress with a new tank,and having not fully matured/cycled water will only add to the mix. personally.if your tank is over say 6-8 weeks cycled, i reckon within another couple of days they will find their feet, i mean fins.lol
out of the box, are you going to add an anemone? only mention this as i have found within tanks that dont have one,they do tend to find an area and stay generally in it.i guess this is the area they call home...
HANG ON, DONT MUD SKIPPERS BREATH GODS GOOD AIR?? BUT ARE THEY A TRUE FISH???LOL

 

i think mudskippers hold some water in there gils. but i could be mistaken...