Basically is a powerhead okay? I've got a tiny tank I am going to set up for a blue leg hermit, a few snails and zoas. It's only 2 gallons, but I figure that with water changes and top offs it should do okay. I've got the motor from an old stingray filter, which basically makes a 36 GPH filter, and was wondering if that was good. I've got plenty of LR and LS to use. Also, would 10 watts of 50/50 be good enough for lighting for a zoa only tank, or should I bump it up to a 10K fixture?