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I just emptied out my 4g pico :-(. It was a fun little tank but it was alot of work in comparison to a larger tank. Water changes were really easy but the parameters can swing big time because of the lack of water. You also can't really keep fish in one, I had green clown goby in mine with a bunch of inverts and coral and that really filled up my tank. So much so I just upgraded the pico to a 20g.
Fun little tanks though.
I bought a rimless glass Finnex tank with a 26watt bulb and a filter and it was about $60. But you still need live rock, sand and a heater. (maybe on the heater depends on where you live)