Tom

The writers of these articles, i.e. myself, Mike, pinkfloydpuffer, all have done our research, compared many other sites, gone with what most of the better stores employees have told us, read books, just not go to google, type in the fish name, and choose the one that seems better for what you think.

I know someone who had a fully grown oscar in a 30 gallon tank, only because the main home, which was a 75 gallon, had sprung a leak, so that person moved the oscar there temporarily, and the oscar had trouble turning around. So a 30 gallon is not suitable for an oscar.

Normally, when someone points a 'mistake' out about one of the articles, that I wrote, I take a consideration, read their point of view, but in other times, I take great offense to all the effort I actually put into the article to write it, and it just gets me upset, and if you ask any of the other mods, I am usually the one who will try to figure out where the person is coming from, not in this case, sorry.

As for the hillstream, like agabr123 says, the tank needs to be a river type tank, with the river simulation for the fish. So a smaller tank just isn't able to do that for a hillstream. I've even had the experience of having a hillstream loach in a small tank, only because the book I used as a reference, had a typo. So the loach was in a 10 gallon, it did poorly, within 3 weeks, it was dead, it just sat there, not doing anything because the tank didn't have enough water movement. But when I put another hillstream loach in my biggest tank(currently only a 36), which has about 3-4 times the amount of water movement actually needed, the single fish thrived. So the larger the tank, the better, for any fish.
Tom