Stocking 25 gallon, what do u think?

My personal preference is to keep cories in groups of 3 or 4 at least, of the same species, rather than one or two of one and one or two of another... and I'm pretty sure the cories like it better that way too.

I'm pretty sure all plecos get to be at least 4" long on the small species and up to a couple feet on the big ones, unless a pitbull is a dwarf variety that I've not come across yet, and you would need to plan a LOT more room for a pleco than your average fish simply due to waste production....

I am clueless about the "little fish"... guppies and swords, tetras and such, as I haven't kept those types of fish in years... I'll let someone else direct you on that, because I have no clue about water parameters or anything.

I have to agree with pinballqueen, you should go with more of one species of Cory cats.

Also it seems like quite a few fish for a 25gal tank.

Swordtails can get to 4"+ and prefer being kept in groups of 2 females to 1 male. In fact guppies and platies prefer that ratio too. I'd suggest going with just 3 platies or 3 guppies. Maybe something cooler like 3 Endler's livebearers.

I'm not exactly sure what Yello tetras are so I can't really make a call on those.

I would like to reiterate that you tank would be a little crowded with all those fish IMHO.

Sam

I haveheard of the pitbull pleco and they do actually stay under 4 inches in size. It would be a good choice. I personally have 3 cories in a 10 gallon 2 bronze (with 1 being albino) and 1 peppered. They all get along veyr well and hang out together quite a lot. So I think 2 or each will be fine, but others obviously see different.

You mention that the tank has quite a bit of height. Height is not as good as length. More surface area is always best and the taller the tank the less surface area and the lighter stocked your tank should be.

I would stick to the tetras and then pick 1 live bearer to keep as a group rather tahn three. Plus swordtail and platies are well known for interbreeding.

From what I understand pitbull plecs get to about 3" and are fairly good algae eaters from rocks and gravel, but won't clean the sides of tanks or plants. I kinda wonder about having a total of 5 bottom dwellers in a tank with a small footprint. If you can find a small ancistrus species (ie bushynose cat) you might be better off just getting one and having some driftwood for him to chew on. Otherwise I'd be thinking more of having 3 corys of one species. As for your other stocking I'm not certain, but I think by yellow tetra you are saying lemon tetra. Personally I probably wouldn't put them in a small tank with anything that had a flowing tail. It will probably be too tempting. As for the livebearers I don't think I'd go with swordtails in a 25g, but platys or guppys should work in the 2 female to one male ratio. I'm really not a fan of having a lot of fish in such a small footprint even though the tank has plenty of height.

shrimp are cool.

Better but not great. The livebearers like to be kept in groups of at least 2 females to 1 male. The betta may or may not fit in. They can be very tempermental and may attack other fish. Plus their long flowing fins are easy to nip.

Cleaner fish like Corys, algae eaters, and Aspidorias species are useful and I wouldn't put together a tank without some of them. But they arn't necessary.

What tetra are you talking about when you say yellow tetra because there are several that are yellow or close to it. Lemon Tetras, Gold Tetras, and Gold Neons all come to mind.

Just a quick note. Lemon tetra should be listed as 2" fish. Also the one inch per gallon rule can be thrown out unless you are talking about fish such as neon tetra. My bigger female peppered corys skin could probably be filled with 4 of my neons. That is to say a tall or wide bodied fish can use up more resources and put out more waste than a fish of equal length, but narrow bodied one. Looking at what you are suggesting I would say you should probably leave out the mollies and bump up to about 7 lemon tetra.