Why yes, I bribe them with live brine shrimp.
I wish I had better than a 2.0 megapixel camera-- I'm not really satisfied with those pictures, but they're the best I can get on the one I have. But to get the pictures you basically have to have a lot of patience. I took about 150+ pictures over a few days (two to three hour stints of sitting there snapping shots at a time) to get the ones I have there. Basically I sat in front of the tank, waited for somebody to come out (or in the case of the angelfish, to get out of the way so I could actually take a picture of someone else), and then tracked them till they slowed down. Then I got the camera to focus in and waited for them to do something interesting, or until I could get a really nice macro image (like with the angels), and shot the picture. It does help if you do it during the day somewhat near when they are fed, because usually everyone will be up and about looking for tidbits.
I would guess my loaches are about 4" long...or so...there's a picture in there somewhere I think where it shows them swimming with my adult pearlscale angelfish, which I did as a size reference for myself..but it came out as kind of a cute picture too. =)
Hopefully this summer when I work 59285984598 hours to get ready to pay my board for next year, and to get more stuff for the saltwater tank, I'll also squeak in enough to get a 4-6 megapixel. For good quality pictures I really think it's necessary, especially for the macro stuff you have to do where aquariums are concerned.
But onto happier topics - your pictures are very nice! I, too, like the clown fish; he's got extra personality. 
Sorry, I'm obsessed. Any particular reason for your handle? "Hypostomus" is very interesting but I regret to say it doesn't make a lick of sense to me. (Maybe I just don't have the scientifical expertise, lol!)
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