"I've only had my tank a few days. It costs a LOT. Found out after purchasing it you can find tanks for 5 gallons with all set up items included for almost half the price. However, I went with this small gem because it had fairly good ratings on here and I needed a small tank for the location it is at.
I put my sole surviving male guppy in it immediately. (Less than 12 hours after setting it up) Would not recommend this for most fish as the tank still needs to cycle. It was an emergency situation on my part...let my guppy die in the bowl with high toxins in the water or risk him in a brand new tank with a possibility of surviving!
This tank is too small for goldfish despite advertising. Goldfish produce a LOT of waste. However, a couple guppies and smaller fish species should be fine in here or a single beta. (If you have a divider you could have 2 beta)
The pump is LARGE. But it works efficiently. The other tanks I looked at didn't have a pump/filter at all or they had one that looked pretty cheap. This one may take up space, but I feel guaranteed it's doing a fine job cleaning!
Also, the pump is quiet. The lid seems to fit awkwardly on top the tank with pump in it. (Weird) Occasionally if messed with much the lid will vibrate. I just tinker with it until it quits and then there is a low hum emanating from the pump only which is quite soothing in my opinion."