IMO, chiller and skimmer is not a must in an aquarium, especially if u’re keeping FOWLR. however, as cheap as it sounds, u have to be diligent in ur water change schedule. step 1 is to decide and how big of a tank u can go (bigger the better, slower fluctuation, more fishes/corals) and where in the house u can place it at. or another suggestion will be to look up BRStv on YouTube, they will literally go step by step with relation on setting up their clown harem tank. eg, tank size, skimmer, chiller, lighting, animals, chemical reaction etc Sent from Singapore Reef Club mobile app