I got 3 panda cory over a week ago think they are great little fish, but you have to keep an eye all the time on water quality as the are sensitive fish, but yours are meant to be abit hardier.
ok people, she had a bristlenose pleco to begin with. a pretty good sized one, too.
the fact that you already had plenty of algae eaters already present and still had a problem indicates to me that the type of algae you had isn't one fish like to eat. what did the infestation look like? was it dark green, light green, brown, etc? was it little spots, big sheets, tufts, strings? different creatures eat different varieties.
also, have you tried lowering the amount of time the lights are on? decreasing the interval between water changes? feeding less food? try putting the lights on a timer so that they are on an hour, off an hour. all of these things are methods of combating an algae infestation.
The Algea is like a green cloud (Volvox) the only thing I can figure out is the water hardness is WAY off, Everything else is perfect. I do a series of six water tests once per week. I will have to try peat fiber to bring the hardness down.
I used a water hardness pillow and brought the hardness down to a moderate hardness (100-120). This only took a couple of hours with the pillow in the tank. When I woke up in the morning low and behold CLEAR! Not a speck of algea anywhere and it has stayed that way for 3 days. Yahoooo!