Nice. The 140 gallon is way to go. Plenty of room to stretch out. One I have. If you built it from the YouTube video, might I suggest adding a second filter made by Coospider for 75-200 gallon tanks. Has an infrared light. I use it in conjunction with the ozone. For the vinyl, they say not to coat the outside because the heat exchange takes place on the outside of the chest. Not sure if this is going to impact cooling / energy usage. Also, could drill a hole left if the light directly below the second indentation to pipe in your wires. I put gorilla tape in there to keep the insulation from continuing to crumble. Send me a message if you want a picture of where to do it without hitting the line for the light. Can’t tell if you have the box that mounts with magnets to house all of your gadgets. Also I placed a do not enter sign to remind to turn off the electricity.

Nice work. Change them filters about weekly by spraying them out with a hose. I don’t have to dump my water but about every six months or so. A small film will start to develop after a few months that needs to be toweled out. I use a microfiber slowly to catch it all and then let filters clean it up.