I never used to quarantine new fish until I had a huge ick outbreak in my wifes livebearer tank when adding some platies from petco. Lesson learned
I just picked up a (I guess bellycrawler) pike cichlid and put him in a 10g quarantine tank. How long should I keep him in there until I know he's good to go into my 150g? Thanks!

I just picked up a (I guess bellycrawler) pike cichlid and put him in a 10g quarantine tank. How long should I keep him in there until I know he's good to go into my 150g? Thanks!
4 weeks minimum. Be patient and don't take shortcuts. You'll feel more relaxed and comfortable if you are consistent with a long quarantine period just to protect your much older valuable fish.