Ok, I finally got to read a bunch of posts from people asking about Kuhlis with Neil Monks advising them.
Neil was one of the people that helped me when I first got into puffers. While I'd bet that he doesn't remember me I consider him to be one of the aquarium gods.
He actually has fossils named after him.
Neil says a 10gal. is the minimum tank size that can be used. I still don't think I'd do it because of their activity level, but that's me.
When you have 4 I'd just watch their behavior. Even though they're nocturnal my guys are out all throughout the day playing and looking for food. I swear they are so silly.
I believe they're really happy. If yours stay hid all the time then I'd add a few more. It's great that you use sand too since their little bodies can get scraped up with gravel.
When I had that first set of loaches in the 30gal I didn't have a lot of fish with them and I swear they would lay drapped all through the plants all the time. They would sleep on their sides on the bottom of the tank but for the most part they were all literally hanging in the plants. Sometimes I wish I could have a tank soley dedicated to the kuhlis.
How about adding a few more corries? I'm sure they'd be happier with a few more.
You know it's good to be happy but even better to be ecstatic.
Sometimes I have water babies for so long that I forget the basic care that I learned in the beginning and have to go back and refresh my memory.
Warm Wishes, Beth
i currently have 2 (getting 2 more when i can find them) in my 20 g. Sand, fake plants, 3 betta girls/3 platies and 2 corey cats. They seem quite happy.