I've had my male betta for one week and he's been doing great, out exploring, resting, swimming everywhere, etc. Yesterday I added 6 corys and 5 rummy noses (sp?). Interestingly, he's leaving all of his new tankmates alone. My concern is now my betta is only coming out a little bit and pretty much staying on one side of the tank. Are the new fish too boisterous for him? Would he prefer slower moving tankmates? Please advise.