Would you please explain for me what sort of problems those two may poses on my FL-Gar?Your problem is glaringly obvious; you need to ditch the arowana in the very least and possibly the clown knife.
They get along very well & I love all of them... The ONLY problem I'm facing with that combination is that the Gar is sluggish & doesn't compete for food compared to the other two. & I'm compensating for that by putting more feeder fish & wait & make sure that he gets his share...