Newbie First marine tank

Hello All

Greetings from Singapore.

I find marine tank beautiful and facinating to watch. would like to
know how to to keep prawns.

what do i need?

i have a 2 feet tank and would be keeping normal grey prawns for a
start.

would i need a protein skimmer? A filter, lighting? etc?

do i need live rock and sand and if yes, can i collect sand from the
beach as live sand

i cannot afford a chiller

what SG is good? 1.022 or 1.024. or lower?

As its a first tank, i dont mind it being bare if its easier to keep


many thanks