Fish are pale and some keep dying
I have had the same problem. I went away on holiday for a month - supposedly entrusting my fish to one of our friends. Although the fish were fed, he didn't clean out the tank at all, so I came back and my little tank was covered in green algae. I couldn't even see through the glass.
I spent about 4 hours scrubbing the tank from top to bottom, and took out as much water as I thought safe.
After doing this, alot of the fish (especially the tetras) became brighter. However, there are 3 or 4 fish that are still really pale.
Also, I keep waking up every morning now (its been 3 days since I cleaned the tank), and finding one fish each day dead.
Is there anything I can do to stop this?