30 gallon freshwater set up for almost 3 years. I've recently gone through an Ick out break, which I believe is done. However, the 2 clown loaches and the 2 do jo loaches are totally not acting "themselves." Temp. is at 79 and the hang around the top of the tank. Recent WC was about 25% with no change in their conditions. Also, no one eats. In addition, the purple algae is irritating to look at. What's going on? Thank you.