SnowQueen said:
Alien Anna, I love the plant idea. What is your opinon of using the ammo lock and the plants. I know that you don't like to use chemicals, but what about in an emergency?
In an emergency you do what works. However, you have to be aware of the downsides: chemicals like Ammo-lock will mess up your water parameter readings (they will read as ammonia zero, when in fact it isn't really). As the fish are still producing ammonia, the point will come when the amount of ammonia exceeds the abilities of Ammo-lock to "lock" it and you'll get a sudden, unpredictable "spike" in ammonia levels.
Another problem is that although the ammonia is toxic, the nitrifying bacteria actually need it to grow, so if you effectively remove all the ammonia from them, they can't grow. The net effect is that cycling takes longer, but if the choice is between that and losing fish... well, needs must.
Using green plants is a much better solution: green plants can actually directly convert ammonia into new plant growth and at the same time, they act as a great substrate for the beneficial bacteria to grow on. So they don't slow down cycling but do remove the ammonia - win:win.
If you don't want live plants, or you have fish that will eat plants, you can get elodea or hornwort dirt cheap. Neither plant actually looks terribly attractive in a tropical aquarium IMHO (both get rather straggly) but they'll grow like wildfire!