Rocky

any suggestion where i can get it at a cheaper price?

so is external filter or internal overflow filtration system recommended? if i opt for internal overflow system, does it mean that i need to customise a tank?

Wish to start a marine aquarium in 3ft tank. Would like some advise on where to get a tank, do I need to customise it? Or can I just get from Pasir Ris farmway? How about filter, good to have external filter or in-tank overflow system. No space for sump tank as yet. Do I need any skimmer?