Used fish tank cycling?

If the tank is dried, and the filter is dried, then you need to cycle it again.

If you have no fish or any other source of ammonia in your tank for more than a few days, then you need to cycle it again.

Beneficial bacteria for nitrogen cycle only live off ammonia. Without it for more than 24 hours, they start to die, and it won't take more than a few days for them all die.

These bacteria also must live in the water. They die if they are out of the water for more than a few minutes.

To do a fishless cycle with pure ammonia which is the most efficient way to cycle, use the following article as instruction.

http://petskeepersguide.com/fishless-cycle-nitroge...

If the gravel and filter were kept wet, then it's likely the tank still has some cycle. Enough to support a few fish anyway. Add some small hardy ones, let things settle down and then gradually add more fish.

If things have dried out, or been thoroughly cleaned, then you will need to cycle again.

The bubbles are normal. The water in the mains are under pressure, and so hold more dissolved gas. Not very much of course, but when you let that pressure off (by putting it in the tank) that extra gas is released from the water, and make little bubbles in the side of the tank. It will go away in a day or 2. You wont usually see it when you do part water changes as you are only changing part of the water, so not enough gas to form bubbles.

Ian

Any filter that hasn't had water running through it (note: this is different from being kept wet; water actually needs to be moving through the filter) for more than one hour has dead bacteria in it. That's about as long as they can survive without any sort of water movement.

Those bubbles are nitrogen bubbles; they collect on everything when you fill up a tank. Just leave them, they'll be gone in a few days.

All they could desire to be attentive to for now's that fish produces ammonia that's risky. the completed concept is to get advantageous micro organism which will convert ammonia and nitrite (that's some thing that follows ammonia) into waste it somewhat isn't any longer risky. i does not propose organic ammonia for novices. in case you have a healthful tank the suitable factor you're able to be able to desire to do is supply that person some micro organism to hurry up the cycling technique. Then upload a pair of hardy fishes and the tank could desire to be cycled in a remember of days.

Was the filter media kept wet?

If you're working with an old tank and filter that has been in storage, then you still need to cycle it.