Should i add more corydoras?

I'm going to a vacation this week so I'm going to add more corydoras if I should after the vacation.

I has 3 three striped corydoras. I know it's not a lot. 2 of them are friends. However, I feel like the other one doesn't really get along with the other two. He's not shy, it's just that he won't sleep or play with those two. I bought him with another corydoras. They were best friend. However that best friend died, because of swim bladder disease. We also lost 2 more corydoras before that. So 3 died. Now 3 are left. I was thinking of adding more, but because of these deaths, my family members and i think that they're soft, and we're still beginners at keeping corydoras and we should not buy them any more because we don't want any more deaths. However, I feel that lonely guy want a friend so Im thinking of getting another or two. What do you guys think? It's a 20 gallon high with:
1 betta
5 neon
1gzl
3 corydoras

 

Corydoras always do better in groups. I would recommend 3 more. It would also be smart to quarantine them in a cycled tank if possible...just in case.

 

Corydoras always do better in groups. I would recommend 3 more. It would also be smart to quarantine them in a cycled tank if possible...just in case.

I quarantine them 2 weeks every time, just in case they don't bring any diseases. However, I dont use an cycled tank. Instead I use tss. Is that fine? Also, I think 6 corydoras will overstock my tank. Can I do a few less? If not, should I do more water changes?

 

How big is the tank.

Corydiras kept in the right way ate pretty bulletproof.what are you feeding ?

 

How big is the tank.

Corydiras kept in the right way ate pretty bulletproof.what are you feeding ?

20 gallon high. I feed them hikari sinking wafers.

 

Corys do best in groups of 6 or more, but will only school with their own type. I would get more striped Corydoras.

 

Corys do best in groups of 6 or more, but will only school with their own type. I would get more striped Corydoras.

How many? 2 more? I don't want my tank to be overstocked. They're all three striped corydoras btw

 

A rule of thumb is an inch of fish per gallon. Depending on the size of your fish it would be overstocked.

 

I haven't experienced a lot of fish keeping so correct me if I'm wrong. Since corydoras uses the bottom, neons the middle and the betta the top, doesn't that mean you can put more than 20 inches?

 

I’m new too, but from what I read I don’t think so because it will still contribute to the bio load. Also, if you have a betta in there, an overcrowded tank will cause it to become aggressive.

 

The one inch per gallon rule has been discredited. The common example is a 10 inch oscar in a 10 gallon tank.

This will help you determine the bioload of different tanks of fish.



There are other online.

 

The one inch per gallon rule has been discredited. The common example is a 10 inch oscar in a 10 gallon tank.

This will help you determine the bioload of different tanks of fish.



There are other online.

I use aqadvisor, but I can't find my gzl (gold zebra loach) in there. I don't know what to use.

I’m new too, but from what I read I don’t think so because it will still contribute to the bio load. Also, if you have a betta in there, an overcrowded tank will cause it to become aggressive.

I also have a extra 5 gallon so, if he gets aggressive, I'll put him in there.