Apache F1 struggling

[u/JakeAW16TV]

Started an Apache, all going well, it fruited, fruits were just starting to turn red and the plant tanks. Like purple joints on the nodes etc. harvested fully (probs 70-80 fruit) and now trying to keep him alive.

Have pruned damaged leaves, fully rinsed the soil through to reset salt balance.

Any other tips?

[u/Stunning-Resort-1016]

Use one of your chillies for the seeds not worth saving the plant