Whether or not you need fans depends on the design and rating of the heatsinks. If the heatsinks are designed and rated for 3 watt ram chips, with no fans, they should handle the 3 watt LEDs with no fans. Otherwise, you should have fans.
the touch method will tell you if you need to cool them but the cooler the emitters are the more efficient they will run and the longer they should last. I force cool most of my leds but I try to keep them cool enough when the fans are off so that when the fans fail, and they all do eventually, I don't ruin my emitters.
Something my husband did for our led build was have it be water cooled. I have the Eclipse 2 filter and he drilled a small hole and ran airline sealed with silicone to the top of the heat sink (he angled it slightly), and then created a lip so the water wouldn't run back under to the leds. This cooled the light right down and as an added bonus I don't need to run a heater while the light is on as it maintains the water temp at 78'F.
I think you should be fine. Similar heatsinks are for sale for the same purpose at [Ebay Link Removed] [Ebay Link Removed] I wouldn't use a fan, instead I would buy a larger heat sink if the leds get too hot.