Was the filter moved from a smaller tank? It may just need to catch up.
No, the filter was in the same size tank, but that tank also had a small canister filter running on it, plus a lot of established plants. A much heavier bioload than this 'new' tank as well, but between two filters and a load of plants, I don't know how much of the ammonia was being processed by the sponge, you know?
I suspect since I have no signs of ammonia, and I had nitrites and nitrates, that like
@Naughts said, all the bacteria needed are present, just need to catch up a little now it's the sole filter on another 15 gallon.
I bug misconception for beginners is “Oh, my filter cartridge is dirt, lets thoroughly writes it off under the tap water”.
That was my thought when I first started keeping fish. I now know, that is wrong.
If that is true, then why is everything I have 1( Heard on TFF, and 2( On the internet the exact opposite? Those sources say to never rinse it under tap water and to never leave it out of water. (As it will die)
I have been telling people for over a year now never to rinse it under tap water, or leave it out of water.
Don’t mean to call you out, but the information your giving is not adding up...
(Sorry
@AdoraBelle Dearheart for hijacking your thread)
I've heard the same things
@Ch4rlie is saying. Think of it this way, there's a difference between a filter that is brand new and has no nitrifying bacteria, and one that did have a full colony, but was rinsed under a tap. When a beginner does this, chances are that they washed away and killed a good amount of their bacteria - enough to cause a mini cycle and ammonia spikes - since the colony had grown in balance with their tanks bioload - but usually, there are still enough of both types of bacteria left for the colony to quickly reproduce and catch up. That's what most mini cycles are after all.
When I used an anti-bacteria med during worm treatment (since worms can cause damage to the fishes intestines, secondary bacterial infections are common, so it was a precaution) it caused a mini cycle in both tanks. My 15 gallon recovered quickly since it wasn't overstocked and had a lot of fast growing plants - they dealt with most of the ammonia, so a water change was all I needed, and within two days, the mini cycle was over and the tank was stable again. The med clearly killed a lot of my BB, but nowhere near all of them.
The 57 gallon is overstocked right now, and only had slow growing plants, and the ammonia and nitrites were higher. I as bracing for this so was doing water tests and did large water changes, so didn't lose any fish. That tank needed more water changes and an extra day or two to recover from the mini cycle.
If it was a complete beginner who doesn't know the nitrogen cycle and didn't have such a heavily planted tank, or it was overstocked, that could have lead to sky high ammonia levels and a tank disaster that killed the whole tank. But under lab conditions, tests show that these bacteria are more robust than we sometimes give them credit for. So if say, you switched off your canister filter for a week, and when you opened it it stank to high heaven - there's still a good chance that rinsing the media in tank water then refilling it and turning it back on will work. You'd need to rinse out the dead bacteria of course, stinking media isn't good, but a lab test would likely show a bunch of bacteria survived, and can restart the colony much faster than starting over again with a new filter.
So yes, don't rinse filters in tap water, or dry out filter media you want to continue using - it's not needed, and it will likely kill a big enough chunk of the colonies to potentially cause a disaster. But on the other hand, if someone has rinsed their media under a tap, it doesn't always mean their entire cycle has crashed and they're starting from scratch either. If they're cleaning their tank weekly and rinsing the sponges under the tap every week, their causing a mini cycle every week, and the colonies keep getting knocked back every time they try to grow to handle the bioload of the tank... ammonia spikes and unstable parameters and fish deaths usually follow. But if they stop rinsing the filter in tap water, enough bacteria will have usually survived that the colonies can catch up much faster than if they were starting a cycle from scratch.