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I mentioned earlier this week I'm setting up a tank for Corydoras and Plecos, but I'm looking into keeping some of the more sought after Corydoras.

I've had many species of Corydoras before and the only one I ever had a problem with was Adolfoi. The only one I had died after about a week, and I checked all my water parameters and they were fine, however somebody I know told me they need well-oxygenated clear water, is this true? I ask because I've never had one since, as I don't want to lose one, and pay the relatively high price and the it dies.

The tank as I mentioned earlier will be a 10g tank with Fluval 1 Plus, Elite Mini Filter, and a 50w heater. I was looking at this stocking-

1 Bulldog Pleco
2 Pitbull Plecos
2 Cory Trinilineatus
2 Cory Similis
1 Cory Sterbai
1 Zebra Danio
Possibly C.Adolfoi

By the way the reason I am only going to have one Danio is because when I've kept shoal of Danios in 10g tanks, one Danio has become dominant and harassed the other Danios.

That tank plan includes too many fish, and should be toned down a little bit.

First of all, three plecos in a ten gallon tank? Plecos produce huge amounts of waste, and ten gallon tanks are prone to sudden changes in water quality and/or chemistry. Those fish would add all kinds of waste to the water, to the detriment of the tank. I'd remove two of those plecos before going any farther.

As for cories, you probably know that they are shoaling fish. I am of the opinion that they are happiest in groups of at least six, especially when those groups are consisted of a single species. Now, it is certainly okay to have multiple Corydoras shoals in one tank, as long as they contain enough fish per shoal. You don't have the room for several shoals, so I'd have just one shoal of six cories, whatever species you choose.

The same thing goes for danios, they are shoaling fish, do best in groups of six or more, yada yada. However, since they are really active fish, I don't think that ten gallons is enough room for them. They need lots of room to move about in, and to escape the dominant fish.;)

Sorry about being all negative, but I'm just stating my opinion. You can still have a nice stocking list in a ten gallon tank, it would just have to be switched around a little bit. Here's an example of what you could keep:

1 pitbull pleco
6 Corydoras similis (or another species)
6 cardinal tetras (or some other small tetra)

C. adolfoi are not very difficult to keep. In the tank that you mentioned with proper filtration it should do fine. Instead of having one or two of a particular species why don't you keep two small groups of two different species. The Corys will be more comfortable and you will have the opportunity to breed them. I also agree that three plecos are too much for the tank.

Mark