How many rummynose tetras in a 29?

[InuYasha]

From my saltwater experiences, you shouldn't do water changes during cycling. It removes the nutrients that you are attempting to create using the guppies (and on a side not, nothing personal, but I disagree with using living things to cycle a system, small amounts of food or a piece of shrimp works equally well).

 

[kveeti]

If somebody decides to use fish for cycling then, yes, they should do water changes – although not arbitrarily. They should have test kits and do water changes to keep ammonia and nitrIte levels low. As long as there is ANY reading on a test kit, the cycle will progress; it will not be slowed.

 

[Rushdude]

I have been using fish to cycle fish since I have been in this hobby. It has worked well for me. I used a zebra danio 5 years ago to cycle a ten gallon and it is still alive today. Chunksofpooo, thanks for reminding to research the fish. I might of forgot. At one of my lhs's they have a type of rainbow fish that sell for $20 and at another a kind of rainbow fish that sell for $4. Is it the type of rainbow fish making the difference or the lfs trying to sell a fish for a lot more than they are worth becuase of their looks? I remember the name of one of the $20 rainbows, I think they were blue river rainbows or something like that.

I have never had a saltwater tank but the people at my lfs cycle their salt water tanks with jack dempsies. The just opened up and the first day I was there their salt tanks were cycling with those fish.

Also in my cycle I have a filter cartride in the filter from another one of my tanks.