10-23-2011, 01:12 PM
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First thing, welcome to Tropical Fish Keeping forum.
To your question. A couple issues stand out. First, the water current. Cardinal tetra do not appreciate water movement. For several years I have maintained this species in 4 and 5 foot tanks, and without exception they remain at the farthest end from the filter outflow, among the shade of overhanging plants. You might want to consider reducing the current generally.
To the pygmy cory. This is a shoaling fish, all cory species are, so it needs a group. In my experience, the dwarf species like this one do best with larger groups, 8 or more. A 20g would be ideal. In the meantime, one will be very lonely, and might get quite stressed as a result. But December isn't far off, and as they have them, you might consider getting more now, in case they sell out. This species is very social.
The Yoyo Loach is also shoaling, and I would strongly recommend another 3 to make a group of five, assuming you like them. They will be fine in a 55g. The interaction between them will be worth it, loaches are also very social fish.
The golden algae eater might be trouble just waiting to happen. This is likely a variant of the common Chinese Algae Eater, and not a fish most of us recommend. You can read more in the profile.
Some of the names above are shaded; that means the fish is in our profiles, so click on the name and you will see its profile. Profiles in general are under the second tab from the left in the blue bar across the top of the page, and most of the commonly-seen fish are included. Info on water, tank size, temperament, compatibility, numbers, etc are included for each species.