Should i stay vegetarian or be pescetarian instead?

So I've been vegetarian for almost a year now with the intent of going vegan. Recently, I've changed my mind about that due to a change in my religious beliefs. But I still don't want to eat meat because i think it's unhealthy and factory farming is wrong. However, I am considering eating fish and other seafood again. I'm having a hard time finding sources other than PETA (which i do not trust) as to the treatment of the fish. Are they really mistreated as badly as PETA says? Please do not tell me "fish have feelings too". I know that. I just don't believe it's wrong to kill an animal for food as long as it is not abused beforehand. Thank you!