Fishkeeper123, you did see I was talking about trying 1 gourami if you decide to do it at all? & Essjay is correct, but 3 spot is also a less common name these days, here (US) anyway. He must be old too, ha! Do not get a dwarf, honey or pearl by mistake. But study the tank of any possible signs of diseases. When in doubt, wait! We're not talking about rare fish, they will have more soon.
I have heard good things about some Maidenhead Aquatics, but they are a chain, so different shops may not all be the same. Do you need a refresher course of what to look for? There are a few of us that have a list, lol. But I don't feel like typing right now...almost dinnertime.
I'm very happy you will quarantine any new fish! This is a sign you're well on your way to better fish keeping (along w/more water changes! lol). It only takes 1 really awful new fish experience to put 1 off our hobby. You'll never be sorry you took this big step, a PITA, but well worth it. Always service the healthy tanks 1st, then the QT. Rinse the siphon & every bit of equipment afterward & allow them to dry out. Some of us have separate QT equipment...but you're probably not quite there yet...Do the best you, can but be aware of cross contamination from nets, etc.
I use a gravel vacuum into a bucket (or more). I have 2 sized vacuums, 1 for larger tanks, 3 or 4 inches x inch+ & a smaller round 1, maybe 1 inch or so. My husband often helps empty them. But neither of us can carry as much as we used to. I have a Python I use for refilling, dosing Prime dechlor for most of the tank's volume unless it's just for 1 medium or smaller tank. Then I use gallon jugs with 2 drops of dechlorinater each & pretend it's exercise. My 50ft Python is heavy to drain & wind up. I also weed plants into the buckets & throw them around garden plants or the compost pile. The Python clogs & slows with plant debris, mosses are especially problematic.