Couple of Answers Needed

[Madreefer]

1: Is there a time period where the seas and oceans current comes to a lull so fish and coral
can eat? Or do fish have to work for their food?
2: Does the moon actually give off enough light to help the fish navigate and does the lunar
cycle actually effect how fish larvae or eggs hatch? And do fish sleep?
3: Why when diving or snorkeling do we quite often come across cold areas? So what is
an ideal temp?
4: Does the seas or oceans ever stop skimming or is it a 24/7 operation? And that foamy stuff
that is on the beach good to play in or bite at? I see small kids do that often

I ask these questions all though they may be silly cause I don't really know the answers and if I'm trying to recreate a little ecosystem in my home I would like to do it right.