probably a bubble tip they aren't exactly what I'd call hardy but are probably the hardiest clown host that I know of. They however will not do well if there are lots of nitrates and other polutants in your tank. I would strongly encourage you to remove your crushed coral and make sure that you have enough light/skimming to keep them healthy. I don't think that your strip light would be strong enough I'd go with halides and vho acintic.You also really don't need to add a lot of live sand if your tank is cycled you can use the crushed coral to seed your sand with the needed bacteria. Also the little infaunal critters will come off of your live rock so you really don't need to buy live sand. You could also maybe trade one of your s.w. friends a cup or two of sand and that will increase your bio-diversity. I don't know what anyone elses opinion is but, I like to get my live rock from a bunch of different sources because it will really add to your bio-diversity.
hth
chris
hth
chris