Really Struggling

[FishGuest5123]

Probably just the deep cleaning and stirring things up. Do another pwc and watch it.

 

[Byron]

Agree. On the pygmy cories, you need to add more to the group, another 4-5 minimum for a total of 8-9. The dwarf species of cory do not do well without more of them. And they need sand, can't remember if this is applicable here but it needs mentioning. And cooler temperatures, no higher than 75-76F (24 C).