I have three tanks and my 100 liter is my community tank. It contains my two female powder blue gouramis, four zebra danios and five black tetras. It is a very successful community. My zebras are quite bold, they nip the fins of my gouramis. Anyway, I highly recommend these fish for anyone. If you want to breed these fish you're in luck, they are among the easiest of the egglayers along with the nest building gouramis.
I heard that these fish breed a lot, however I have never found any babies (assuming they or the eggs were eaten by other fish). Then I learned a trick from a friend, that when you vacuum your tank, instead of dumping the water, let it set for a few days, and you are bound to have some fry appear. Just keep them separate with filtration, and feed them small fry food till they're about 2 cm, and they can go live with the others. Worked for us...
Although most articles on Zebra Danios would describe them as top to middle swimmers, my personal experience is different. I have a school of seven zebra danios and what I have observed is that they are keen bottom swimmers, not only in search of food but apparently enjoying it, if the situation is correct. My zebras were the first fish I introduced into my 180 liter tank and they were swimming all over the place, including the bottom. Thereafter I introduced some opaline qouramis and I noticed that the zebras no longer visited this area, choosing to remain near the surface. This is even though the gouramis did not harrass them as far as I was able to tell. One or two of the zebras did visit the bottom during this period, but those visits were frantic, quick and apparently only in search for scraps of food. However, recently I decided to give the gouramis to a neighbour and after that I delightfully noticed that the zebras were swimming again around the bottom, which they share with three juvenile rams. Therefore, zebra danios need not be merely top-dwellers in a tank - they can be bottom-dwellers too, provided it seems that they do not feel threatened.
I currently own a zebra danio. I got one after the pet store had run out of mountain minnows. They are great fish to keep and it's very basic to keep them. My zebra danio is a food stealer. Every time I feed he is always the fish to get the food. These fish are very attractive and they go well with the common goldfish and mountain minnows.
I live in Japan and can find these in albino versions with barely visible lines, or those who have partial white coloration usally divided in half (the head is white and the tail is normal). I own an albino and it is very active and LOW maintenance! I like this fish a lot and have had absolutely no difficulties with it.
Zebra danios are one of the best little fish I have ever seen! They are constantly on the go, they are even better when in a bigger shoal. I would not put them in a tank that is under 60 cm long, because they are so active. I had 5, lost one and added another with 2 leopard danios. The leopard danios shoal with the zebras. My group is slowly on the rise, they get more active every addition!
These pages have enough comments to give the reader a basic idea on the topic. Further comments are still very welcome (through the site's contact form) as long as they provide new and/or advanced information not yet discussed in the existing ones.