Move Tanks

[Questions?]

i have 2 corydoras, and 4 pygmys in a 10 gallon tank with my betta fish, and 1 minnow. i was wondering, if they would be happier in a storage container, that holder only 6.6 US gallons, but also has live plants, and i will move the decorations with them. . it would be bare bottom, and i would be moving the filter and heater with them too. anyone know if this would be a good idea, as i want to keep something else in the 10 gallon, and i don't really look at it often, sadly. I think you guys probaly think this is a bad idea, but, the filter is 6.6 gallons, and it has a huge surface area of 19 inches (length) 13 inches (depth) 6 inches height (really is seven, but i don't want to overfill. it has live plants, and everything, and ive already kept these fish in a 5 gallon before (i knew what i was doing ) and they did fine, and are really happy. so tell me what you think. please no rude comments