Chris Le

Hi, About to embark on a new marine journey. Have a few questions in mind, hoping the gurus here can help out with. 30Cm cube tank 5mm thick. Would this be enough for a pair of clowns and maybe just a couple of low maintainence corals? Could i go without a filter and just use liverocks for the main bio part and a skimmer? What makes of skimmer is good enough for this tank and will not burn a hole?