Question: questions to ask when buying a used fish tank?
Answer: Leakages. This is perhaps the best situation you can be in. ... 
The Duration for Which It Was Kept Dry. First, you must ask the seller about the time duration for which the aquarium has been empty. ... 
Type of Fish That Were Last Kept. ... 
Integrity of the Frame. ... 
Water Leak Signs. ... 
Integrity of the Silicone Seal. ... 
Cracks. ... 
Chipped Glass.