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The main reason people go for 2nd hand stuff is probably due to budget concern. I am not saying it is not good to buy 2nd hand item, in fact it is a great way to save money Most of the time, you will not regret buying 2nd hand stuff, as they work just as good as first hand items. (At least from my experiences, i met lots of great and sincere sellers) But this doesn't mean there are room for complacency, you need to do more research on the item you are planning to buy, identify the pros and cons of getting a new one and a old one. The fair market value is applied here, between a willing buyer and a willing seller, neither being under any compulsion to buy or to sell. Do take note that the price are cheap for various reasons. Just a few examples, for a tank there might be scratches and irremovable dirt where new tank don't, there might even be leakage of water! for equipment that relies on power head / engine / compressor / etc. , there is a diminishing rate of its power most 2nd hand equipment doesn't have any warranty left, so if it's spoil, there goes the money Basically the item wont be "Perfect", and if you are a perfectionist it's gonna ruin your sense of ownership for the item. If budget is also not really your concern (Sadly budget is always my concern ) and the price of the 2nd hand item is not really dirt cheap, I would probably suggest you go for first hand item. (Example, 1st hand cost $100, 2nd hand cost $70.. what for buy 2nd hand?) There are unseen "risk" in buying 2nd hand goods, hence you really need to compare the cost of these "risks" and the amount you saved by purchasing 2nd hand goods. It will definitely be better if you can provide more details regarding the 600 dollars lobang, for us to give suggestions =D cheers, my 0.02

The best person to get real answer is to ask the person who sold the fish. Because it has a blue angel feature, yet have a crown and yellowish body.There may be a raise of arguement over the correct answer.