Should i be concerned this tank does not have a warranty? I am buying it tomorrow and the poster has very positive reviews. http://cgi.ebay.com/NEW-120-GALLON-...ryZ20755QQssPageNameZWDVWQQrdZ1QQcmdZViewItem Also what about this liverock? its a great deal but should i be worried? http://cgi.ebay.com/SUPER-PREMIUM-C...temZ7744357593QQcategoryZ117437QQcmdZViewItem And finally this protein skimmer is hella cheap? Usually they are a couple hundred big ones. I dont understand? http://cgi.ebay.com/New-150-Gallon-...751975422QQcategoryZ46313QQrdZ1QQcmdZViewItem These lights are also very cheap. http://cgi.ebay.com/ws/eBayISAPI.dl...4954&ssPageName=MERC_VIC_ReBay_Pr4_PcY_BIN_IT Am i just finding good deals or are these products crappy? idk if i should be worried but if they are good products then i would love to buy them because they are such great deals.