Okay, easy does it! No need to panic. The friendly folk of Canreef will help you through this.
First things first, what are your parameters that you are getting with your test kits. Calcium, Magnesium, Alkalinity, Salinity, Phosphate, Nitrate??
If the water is green like you say, a large water change ~50% may be in order.
Also, I am curious as to what kind of 'filter' you are talking about..? If you have a sump w/ protein skimmer. And are running some sort of carbon/GFO media you should be good without one. Canister filters tend to do more wrong than right when it comes to a reef tank. They have been coined the name 'Nitrate Factories'.
The picture of your tank shows me promise, so I would not worry too much. It can get turned around.
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