Why are my new goldfish gulping at the top and tank water is green?

Question

I have recently got 2 gold fish(Saturday) night ish and got a medium size tank with no pump but told that dosnt matter at first the fish would swim little and stay near the stones/ground the next day the water went green the swam around abit more but kept going to the top of the tank and looked like gulping I was so worried so I thought I’d google it just carnt find much so I thought I’d leave it another day see if anything has changed and went to look at them this morn there was bubbles at top

Debi Matlack · Accepted Answer

Goldfish are surface breathers so seeing them up at the top is not unusual. They are also very dirty fish, so I recommend getting a small pump for aeration and doing a partial water change. There is usually a period of cloudy water after establishing a new fish tank until the bacterial balance is established and stabilized in the tank. I also recommend getting a siphon--type tank cleaner so you can use it to clean the gravel as you remove some of the water. It acts as a vacuum to pull out all the fish poo that settles to the bottom, and the water you remove from the tank is a great thing to water any plants you have with, as it also fertilizes them. Remove no more than half of the tank's water and replace it with clean fresh water that has had the correct amount of water conditioner for the volume you're adding.

Why are my new goldfish gulping at the top and tank water is green?

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