Can anyone tell me what these blue fish are????

[DB junkie]

 

[Milingu]

looks like quite old and big Aulonocara stuartgranti

 

[tlindsey]

View attachment 1503256View attachment 1503257

D deeda
DJRansome
Milingu

 

[duanes]

A

looks like quite old and big Aulonocara stuartgranti

Agree
There are many Aulonocara that look similar and are often named according to and after the locations in Lake Malawi (Nyasia) where those particular color variants are found.

 

[A201]

Looks like it might be a Copadichromis Azureus
to me.