Congrats on the BioCube and welcome to MAAST. I would just get the thing going and get a good feel for it before adding anything other than macro algae, ive sand and live rock.

As already mentioned these tanks are meant to run themselves and don't NEED additional equipment.

Once you get a feel for the temp swings etc... then you can make a decission as to what you need. When talking about heaters, you may need one or you may not. Depends what kind of temp you keep in your house.

Anyways.... have fun. Can't wait to see some pics.