How many Corydoras, can I put in a 20 gallon tank, along with 9 glow Tetra fish?
20 gallon high or 20 gallon long?
And what kind of Cory are you talking about?
Your Cory doesn't look well to me...I suspect ammonia or nitrite was too much for it.
I'd use some Seachem prime and do a partial water change. The prime will detox what's in your water.
In the future, I would try a fishless cycle.
I attached a clip of my cories to check out. Usually cories like to be busy snuffling around the substrate. That's typical Cory behavior.
I am thinking that the ammonia and nitrites were too much...
Here's my cories.
https://youtu.be/4B41igzzrJw
I would try and keep a group of 6 corys. Try and get them all the same species. Can you post a clear, in focus, profile photo so it can be identified. Your videos arent very clear.How many Corydoras, can I put in a 20 gallon tank, along with 9 glow Tetra fish?
You have beautiful fish. I am doing Water Changes everyday, and adding, water conditioner. And I'm adding API Quick Start to help get my tank to cycle. I do not know what else to do. I am not sure if my test strips are accurate. I'm going to have to buy API master test kit.
Pic of my Cory Fish.
View attachment 324795
That appears to be a Peppered Cory and if so, you can ( and should) keep a school of about 6-8 of these if you have a 20 long or a school of 4-6 if a 20 high. Bottom line, cory cats do better in schools rather than alone. Be aware that Peppered Cories should get to about 3" so they will take up a lot of your tanks' fish bioload.
If they are smalls ( 1" or less size) , you should be able to get away with adding 5 more but as I said, these fish get large enough that you really shouldn't add much more for a while until your tank gets more established. If they are mediums ( 1 1/4" + size) , I wouldn't add more than 3 more. When your tank is more mature, you can add more.I did not see this post, until now. So I can buy 5 cory's for my tank, I like Cory's they are a neat pet. Sometimes he swims, other times he, or she is in the gravel. I love my Cory, he is soo cool. I have a 20 high.
While you make an interesting argument, some numbers are not arbitrary or meaningless. It has to do with natural habits, personalities of species, reproductive successes or failures, etc. With cory cats, the more the better. The problem is that a nice sized school needs a large tank and the OP has a small one. Most cory species do not do well alone. Pairs are iffy depending on the size of the tank. 3 will tend to spark the natural schooling desire in the fish. If the 3 are all the same gender, that can pose a problem. In the case of livebearers, males are so used to breeding that they can literally screw the female to death should there only be one so you add more females to hopefully keep him from overdoing a single female. In the wild, a male Guppy would be among 30-50 females so no need to worry about overdoing any one female.About how many corys or any sort of fish in a given tank.........
I doubt that any fish can count. So, if you have at least three of a given species, I suspect the fish will feel at home . In fact, your home that you give them is most likely the best they ever had.
Those numbers are just what someone guessed at one time and is not written in stone
So, let's not get hung up on often meaningless numbers.
There are some variables of course. How is you water change routine? How dirty are the fish you have, etc......
About how many corys or any sort of fish in a given tank.........
I doubt that any fish can count. So, if you have at least three of a given species, I suspect the fish will feel at home . In fact, your home that you give them is most likely the best they ever had.
Those numbers are just what someone guessed at one time and is not written in stone
So, let's not get hung up on often meaningless numbers.
There are some variables of course. How is you water change routine? How dirty are the fish you have, etc......
While you make an interesting argument, some numbers are not arbitrary or meaningless. It has to do with natural habits, personalities of species, reproductive successes or failures, etc. With cory cats, the more the better. The problem is that a nice sized school needs a large tank and the OP has a small one. Most cory species do not do well alone. Pairs are iffy depending on the size of the tank. 3 will tend to spark the natural schooling desire in the fish. If the 3 are all the same gender, that can pose a problem. In the case of livebearers, males are so used to breeding that they can literally screw the female to death should there only be one so you add more females to hopefully keep him from overdoing a single female. In the wild, a male Guppy would be among 30-50 females so no need to worry about overdoing any one female.
If I understand the OP, she WANTS a school of cories so needs to know how many will fit in her tank.
FWIW... I did say say "at least three"