Unfortunatly you are sometimes getting hosed. Belonging to and using these boards has been tremendousle helpful to me. After a while of learning from here, you begin to recognize which shops are better to deal with. Some of the LFS just hire people to feed, sell ansd maintain their stocks. A lot of these employees dont have much real knowledge as they're just there to make a check. Some do really enjoy they're job, but just arent informed enough. There are tons of wive's tales, and mistruths out there, and they have heard these and believe them. There are some shops who do really know their stuff though. Look for those. Unfortunatly, they can be hard to recognize to the newbee. Point and case, while recently in the one good LFS we have here. Two guys came in and stated that they needed some fish to cycle their tank. One of the employess tried very diplomatically to inform them that they didnt need to do it with fish. A shrimp would be fine. They didnt believe him, even though I snuck in the quite response "even flake food will do". Then the owner came over and said, "I'll be glad to sell you some fish that you dont really want, may die from the cycle, and will be almost impossible to catch later, or you can drop in a piece of raw shrimp and do the job". They left, (fishless) not believing it, just having to have a fish. I'm sure the owner himself gets frustarted at that kind of stuff, it may cost him theyre business, but concretes mine.
This is a tough hobby, you have a great resource right here onSWF.com. Ask before, just like you are now, and it'll go sooooo much better for you. Keep in mind though, that even here, there are opinions that dont allways agree. Just read the opinions, try to understand where they come from and why, and make a conclusion based on what better fits to you and your situatiion.
I have a 8x 39 watt T5ho on my 65 tall(36 long, 18 wide, 24 deep) and my clam and SPS are doing great. you 220 would do good with 2 of those, and you wont have the heat issue halides will have....
See, Scsi and I have different opinions, rerarch more then you decide.