Water changes...

Hi Hawaii_Fantails, I change my water every 5-7 days, about 25-30% of it.

For a 10 gallon tank, I would change 25% once a week.

What kind of water do you have: well or public water service?

If you are on public, you need to call your water company and find out what they use to disinfect the water. If it is chlorine, you can put your water in a 2 - 3 gallon bucket, and I put a bubbler in in it so that the chlorine, a very unstable chemical, will dissipate. If your water company uses chloramine (chlorine + ammonia) you will need a water conditioner that specifically breaks downs chloramine. I use Prime now, but used Jungle's Tap Water Conditioner or Start-Rite for years. Any of them will do the trick...

Val

I am going to second Val's advice, especially because you have Fantails in a 10 gallon for right now, you will need to get nitrate out of the water as often as possible.