Cycled water in hospital tank..

[makiedog]

If I do 30% WC everyday in the hospital tank, does it matter if the tank is not cycled?

[RyanH]

The short answer is yes it does matter.

Just keep an extra sponge running in your other tanks so you have one ready to go if you need it. Then you do won't have to worry about this issue at all.

[discus_nw]

Not to disagree, but a 30% daily w/c on a hospital tank, assuming it's a standard 20H with a fish or two in it, ought to be okay without a cycled sponge filter in it. Most times, meds are being used that kills off most of the bio-filter in it anyway. I've never had a problem, and never added a cycled sponge in my hospital tank. :)

[Carol_Roberts]

If you can keep the ammonia at zero with water changes you don't need a cycled filter. Easy to do with a small fish, that's not eating in a big hospital tank. Harder to do with a big fish, eating heartily in a small tank.

[usdiscus]

It depends on what medication your using, some require that no water changes be done, so if its a hospital tank, then be aware that it will depend on what disease you are treating for. Tim