Upgraded tank, might have slight ammonia, help needed plz

[SquirrelBait]

Hello, I just upgraded my axolotls from a 29 to a 75 gallon and I kept my 40-60 gallon HOB with old media but also added a fluval 307 canister and 2 sponge filters and hope to get rid of the HOB once I have some bacteria in my canister. Anyway I just tested my water and my nitrites are 0, nitrates are between 0 and 5 ppm but I can’t tell if my ammonia is at 0 or .25 or somewhere in between..? If I do have some ammonia and no nitrites are hardly any nitrates how do I get the ammonia to 0? I already have an ammonia sponge in the canister. And did my cycle crash, is that why nitrates are almost 0? I transferred all the only water, decorations, and filter media and before the transfer the water was 0 ammonia, 0 nitrites, and nitrates were 20 ppm. But I added another 30 gallons of cool prime water to fill the new tank. The axolotls were in the tank when it first got ready but one started having eggs so took the male back to the breeder and I tubbed the females and culled the eggs. They have only been out of the tank 2 days but they’re ready to go back and I’m not sure if it’s safe.

 

[SquirrelBait]

I’ve had 15 shrimp in the tank while the axolotls aren’t in it.

 

[wolfen]

if the filter was in the original tank with your axolotls (I assume original tank was cycled) then the filtration should be able to cope being moved to a larger tank unless the bio-load has been increased.
it isn't unusual to get spikes in ammonia from time to time, this is most common after a water change due to ammonia locking dechlorinaters (ie.. prime) and also some damage to bacteria colony due to chlorine which hasn't been removed (it's always useful to add bottled bacteria 24hrs after a water change or filter clean etc..)
provided the temperature and ph is good then ammonia at 0.25ppm is relatively harmless,

 

[SquirrelBait]

if the filter was in the original tank with your axolotls (I assume original tank was cycled) then the filtration should be able to cope being moved to a larger tank unless the bio-load has been increased.
it isn't unusual to get spikes in ammonia from time to time, this is most common after a water change due to ammonia locking dechlorinaters (ie.. prime) and also some damage to bacteria colony due to chlorine which hasn't been removed (it's always useful to add bottled bacteria 24hrs after a water change or filter clean etc..)
provided the temperature and ph is good then ammonia at 0.25ppm is relatively harmless,

Okay, thank you, I didn’t know about adding bacteria. This is the first time (since it’s been cycled) that ammonia hasn’t been zero. I just added some bacteria.