Today, we found that one of our fish, a red capped oranda, was dead. We tried to get him to respond(soft nudging, tapping the glass, turning it over, and checking for life signs along the way) but sadly, our oranda was gone. I would've liked to check for a pulse but I still nead to learn if I can even do that. However, something that is worrying me a lot is that the oranda had bloodshot eyes when it died, and not before. No visible injury was noticeable, or anything else that looked different than when we bought him.
So, I'm rather scared. We set up our aquarium a few weeks ago and got fish about three days ago. We followed the steps given to us by our fish/aquarium store of preference, down to a t. But yesterday, the cloth we put on our filter to protect the filter was taken out because of algae growth. The tank promptly clouded up very thickly, but today it's clearer, with a bit of fogginess.
I'm worried that our oranda's death was due to the cloud potentially carrying hard sediments and harming our lil guy, or toxins that may have killed him. Our other four are doing just as well as day one, maybe better, but I am still worried.
What should I do to keep my other fish healthy? Are bloodshot eyes a symptom of an illness?(I tried looking it up, but I found no conclusive answers) Or is it because of the clouded stuff that the filter spat out? Is there any testing I should do on the water?
I need answers ASAP! I don't want our lil babs dying before we settled on names like our oranda. I have four living goldfish(Oranda, Panda Moor, Calico Moor, and Lionhead) and a bristlenose pleco. I need to know what I can do. Help, please!