Buy new bulkheads don’t reuse the ones that came with the tank and clean your tank out using a vinegar/water combo  
 
Scrape the glass with a razor  
 
Check the silicone beads thoroughly 
 
Plug the bulkheads fill with water check for leaks  
 
If ok drain and setup your tank as you like 
		
	
		
		
		
		
			
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				 My aquarium is nothing but a smorgasbord for my cats.....
			  
		
		
		
		
	
		
		
	
	
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