I'll start a build thread here soon, but Floor drain - Check, Sink - Check, Washing machine for socks and towels - Check, 30pint dehumidifier draining to said floor drain - Check, Tie in fish room to home return ducting - Not done yet.
Need to talk to an HVAC pro to make sure my plan wont screw up the rest of the house HVAC first. I don't want to vent outside as I don't want to be pulling in outside air somewhere else in the house. Id rather run a small mini split than vent to the outside