How many fish

Yes, they will need to re-establish a hierarchy due to the newcomers.
 
Yes, nothing to worry about.
 
Update on fish stock

So we have
6 Mollys can’t re home them so just keeping them
6 cardinal tetras
11 bleeding hearts
3 panda corys
3 spotty corys not sure what type can’t remeber
1 bn pleco
2 adf what are doing fine hand fed

125 litre tank

I run a 307 fluval and also a small sponge filter

I do 50% weekly water change ( can do more if need be )

Am I ok to up the corys and cardinals still

Thanks
 
Also latest test is
Amonia is 0 alswell
 

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Am I ok to up the corys and cardinals still

Yes, though I would lower the numbers a tad under the circumstances. Cories are the most crucial here, I would get them up to 9 or 10, same or mixed species (but not the pygmy, keep the medium-sized species). And cardinals up to 10.
 
Upped the Corey’s to 10 and the cardinals to 11

I still think the bh tetras are being aggressive and chasing each other around
 
Upped the Corey’s to 10 and the cardinals to 11

I still think the bh tetras are being aggressive and chasing each other around

Of course they are, that is their inherent nature. You see this in most if not all species lumped together in the polyphyletic genus Hyphessobrycon, some species more than others. But the decent number means it will be confined within the group, and as it is their normal interactive behaviour should not lead to anything.
 

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