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Wow - I can see how you would need to change half your water every day - thanks for the photos Sent from my iPad using Aquarium Advice

I actually used to leave them outside - for about 4 consecutive winters (without losing a fish). However, one year, the pond froze solid right to the bottom and everything died. We have very cold winters here (Canada) and it would be prohibitively expensive to try to keep an air hole open in...

I may have rinsed the sponge filter, but didn't do anything to the the carbon or biological

can you send a picture of your tank - I am curious to see how other people manage their koi indoors.

I think the problem was gradual - but I wasn't testing the water - we just noticed that the fish were acting more and more unusual - starting around the end of January. We are on a well, so there are no chlorine issues. The 70 gallon tank has a biological filter, but the tub just has one of...

There is a fresh carbon in the 70 Gallon tank - and after we took the fish out (due to them being stressed) I purchased a new carbon thinking that was the problem. However, nothing really has changed since then. I just checked my water this morning before coming to work and the 70 gallon is...

It was a brand new tank from Petsmart - but I get the feeling it had been in their store for quite a while. But remember, I had all the fish in the tank from the start of January to the start of February with no problems - and then things started to go bad. If there was a chemical in the tank...

What is the best sign to show that the tank is done cycling? My ammonia/nitrite and nitrate are all 0. Yet, when I put one of the goldfish back into this tank, he went crazy - after 24 hours, he was almost dead - lying on the bottom and occasionally falling to the side - and his color turned...

I have an AquaClear 110 filter system - this is the first time that I have used a biological filtering system. My other tank uses the replaceable cartridges. I do have a heater, but I have taken it out - thinking it might be the problem - but you're right I didn't really ever need one for koi...

The tub has a small filter on it that was used on a previous tank. The koi are still in the tub and they seem fine - they don't swim much, but they are eating and are not acting stressed. I would guess that the tub is about 30 gallons. The 70 gallon tank is now testing at 0 for ammonia and...

I have a liquid solution tester for Ammonia and test strips for Nitrite / Nitrate. All results are coming up at 0 - so shouldn't that mean that my water is cycled?

Hi - I am new to this site - but I am hoping that someone can help me. We have two large (12") koi and several smaller koi/goldfish. From April to November, the large koi and some of the mid sized ones go in our pond outside, while the smaller fish stay in our 55 gallon aquarium. In the winter...