skimmer or refugium or say put?

Some SPS are remarkably tolerant. Montipora species, like capricornis or digitata, will probably do well in a lightly filtered tank like yours, as long as you don't overstock with fish. That is assuming you get captive-propagated frags rather than wild colonies. Upgrading to a better skimmer, like a Remora, would be helpful, though. Canister filters, like the fluval, can be problematic as well. Unless they are kept scrupulously clean, they can be a source of nutrients (nitrate,phosphate).

Other SPS corals, like acropora, are a lot more finicky and want more constant, pristine water conditions. Adding a sump and a heavy duty skimmer, plus a refugium, would be a really good idea. It is also considered a bad idea to mix those guys with softies, such as xenia, because of the toxins produced.

One thing you haven't mentioned is your calcium carbonate source. Once SPS corals get going, they will need calcium and carbonate. Kalkwasser is cheap and will help, and two part additives do the job quite well, but the cost will add up.

hi. may i ask what yu use cooler or chiler? tnx

humm, i would ditch the fluval and add a refugium/sump. take out the caulerpa, if you can, and put it in the refugium. 3 reasons here. 1. caulerpa will fight with the corals if close to them, especially sps aswell as the halimedia. energy spent on fighting not growing=less exporting going on and less growth in the coral. sps are weak in the fighting department, everyone kicks their but. 2. in the refugium you can let it grow more(with thinning and good trimming) which will give it more mass and= greater export. 3. you can use reverse lighting or 24/7 lighting in the refugium to help prevent it from going sexual. 24/7 lighting also help keep the ph from fluctuating too much. to be honest i like using caulerpa as my exporter its easy to control, not like some would have you believe otherwise, its the best for exporting nutrients and needs little lighting and current for growth. but for sps tank caulerpa not the best choice. others like gracilaria or cheato would be a better choice, however they do require more lighting and high flow rates. i would also add mud to the refugium with the caulerpa. DSB are good too. depending on what you do will determine the the amount of skimming you need,ex. Xenia like higher nutrient tanks while most sps dont. also macro algae, if for feeding tangs and angels or others go with gracilaria, if for suppling zooplankton type stuff cheato is the way to go. all have there own pros and cons. also how much live rock do you have and how deep is your sand bed in the display tank this will effect the type of mud or whatever you need for the refugium. plus a sump/refugium has many other benefits. you can put all your hardware, heaters and if needed the skimmer ect.ect.. you can use it to acclimate new fish or use it hold frags or poputlate the tank with pods and things. becareful with the anemone and corals, again especially with sps, it will sting them and kill them quickly. if the anemone stays in one place might be able to get away with it but watch it close.

I would check the date on the original post...