Cory cat with shredded fins

[JEK]

I have a 90 gallon tank with 2 silver dollars, a zebra loach, 3 rose lined sharks, 4 glo tetras, 3 dwarf blood gouramis, 2 powder blue dwarf gouramis, a Bolivian ram cichlid, 3 boesmani rainbow fish, 2 clown plecos, and a Cory cat. Within the last 2 days my Cory cat has shredded fins! I don't know what is going on. I saw one of the gouramis picking on him and pecking at his fins. Is he being picked on and do I need to seperate him, or could it be something else? No clue how old he is as he came with the tank when I bought it a few months ago.

Water peramiters:
pH: 8.2
Ammonia: 0
Nitrite: 0
Nitrate: 40
Due for partial water change tomorrow.

 

[Noviceafter2yea]

I have a 90 gallon tank with 2 silver dollars, a zebra loach, 3 rose lined sharks, 4 glo tetras, 3 dwarf blood gouramis, 2 powder blue dwarf gouramis, a Bolivian ram cichlid, 3 boesmani rainbow fish, 2 clown plecos, and a Cory cat. Within the last 2 days my Cory cat has shredded fins! I don't know what is going on. I saw one of the gouramis picking on him and pecking at his fins. Is he being picked on and do I need to seperate him, or could it be something else? No clue how old he is as he came with the tank when I bought it a few months ago.

Water peramiters:
pH: 8.2
Ammonia: 0
Nitrite: 0
Nitrate: 40
Due for partial water change tomorrow.

How bad is the fin? I think cories are schooling fish. Maybe if you got more, he would not be so picked on?

Wait for other people to respond. I am pretty inexperienced and overly paranoid that there is something wrong with my fish.

 

[JEK]

I tried to post a pic but for some reason it didn't load

 

[Noviceafter2yea]

I tried to post a pic but for some reason it didn't load

I understand. I have the hardest time figuring out how to use forums and post pics on top of it.

 

[loachy dance]

Ive seen dwarf. G eat panda corys, just saying be careful.
I just noticed that zebra loach and wanted to say that ive heard people have problem with zebra loaches and yoyos fighting cory for territory.