It could still be stressed out, try covering the tank with a cloth during the day, especially if there is a lot of activity in the room they are in. if it hasnt sorted itself out by next week, consider taking a fecal sample to a vet to check for parasites.
Also! Its is totally NOT TRUE that you should always be able to see your animal in its cage. Anything nocternal will want to be hidden during the day, and have lots of space to roam at night. make sure you have lots of spaces for them to hide.
That being said, the tank you have them in right now is OK, just becasue you should be able to watch what they eat and check to see if they are healthy.
SO, keep them in the small tank for now, but in a month (at the most) they will need a bigger tank, and eventually AT LEAST a 20g.
Any more questions? just ask 
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0.2.0. Leo (Zora and Shiva)
1.1.0. WTF (Jade and Obsidian)
0.0.1. Anolie (Yet to be named)
0.1.0. Irish Setter (Leah)
2.1.0. Holland Lop Bunnies (Romeo, Brody, Zoom)
1.1.0. House Cats (Spirit, Dickons)
One randon balck goldfish in a pink tank.
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