If I had to set up a 50 gal (assuming 36" width) lps reef on the cheap (without being ghetto) this is what I would start with: 
 
- 50 gal tank with no center brace and stand 
- single 150-250 watt MH pendant, fluorescents ok but dont look as good IMO 
- heater 
- 2 MJ 600's or 900's 
- 25-50 lbs live rock 
- thermometer 
- timer 
- hydrometer (personally, I would get a refractometer) 
- salt 
- calcium and carbonate test kits 
- calcium and carbonate additives (turbo calcium, reef builder, kalkwasser or bulk equivalents) 
 
Go bare bottom tank. Save up or tell friends/family that you want aquarium gift certificates for BDay/Xmas and get a good hang on skimmer down the road. I might be missing some incidentals but that's about what I would consider minimum. 
		
	
		
		
		
		
		
	
		
		
	
	
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