I might be a little late on this, but put an H.R.V. system in. They blow stale air out side, and draw fresh air inside. There is a chamber in the middle that helps transfer some of the warmth from the out going air to the incoming air ( especially important in winter). The middle chamber also removes humidity. Standard equipment on new house furnaces, but have other uses in residential and commercial applications. Best not to hook your dryer to anything near your aquarium. There is a lot of off-gassing that a dryer does from soaps, softeners, bleaches, etc., and especially if it is a gas dryer. Best to discharge it directly outside. Make sure you seal the hole well with silicone to keep out any unwelcome guests.