you sound like a very caring and committed dog owner - you will find lots of info here.
will quickly say that your dogs should be separated when you are not there to avoid a scuffle you are not there to take care of and while it can be managed dog aggression to some degree is common in this breed - some links to start below - these really are great and will make for a smoother household etc., my guy Nick was quite good with other dogs and had some play buds etc., but I was also smart about it... prevention/management is key. if he does have husky and b collie in the mix these are also breeds that tend to pick and chose their "friends"...
you can also try crating or covering windows etc., bottom line there are things that can help! and smart folks here....
love to see some pics...
multi dog homes http://www.badrap.org/node/96
smart socializing http://www.badrap.org/smart-socializing
dog/dog tolerance http://www.badrap.org/dogdog-tolerance
keeping the peace http://www.badrap.org/keeping-peace
dog parks http://www.badrap.org/dog-parks
also some great printable handouts - some repeats but also other stuff, bad rap in general is a great site so check around.... http://www.badrap.org/printable-hand-outs