[musho3210]

may you specify what tetra it is please As well as what type of corydoras

 

[musho3210]

finish off your tetras schools before you continue 6 of each

 

[musho3210]

you should get rid of two of your cories, 6 is too much for a tank with those inhabitants. You are already overcrowded without the addition of those tetras

 

[musho3210]

get rid of some other fish then, you could always upgrade your tank to accomodate more

 

[musho3210]

i am going by the 1 inch per gallon rule, im sure they are some exeptions but remember, cories get to around 3 inches, thats 18 inches already