Either one would last you some time. Be prepared to upgrade in the future as it grows. If it was me I would go with the 5x3. But again be prepared to upgrade.
I'd go 5x3 if those are your only choices for space. If you going with rays. Do an 8x3 or an 8x4. That'll give you ample time for the pond build. Then you can have more rays. Cause you'll want em!! If your gonna go custom make it big bro
Well 4x4 and5x3 will fit down the stairs into the basement. Anything 6 feet or longer won't go around the turn. That's the reason for the dimensions. And I'm aware I could have a tank built in the basement. However I'm not living in my forever home so that's out of the question. So I guess I'll have to just biuld the pond sooner than later. I have a tank 18"x5'
120 gal how long do you guys think I could houses couple of motoro pups in there ? I'm running a wet/dry sump with approx another 30 gal of water.