why are my fish dying?

Hi There - Brand new to fishkeeping and have read a lot online. So I think I know where I went wrong, but need to confirm before I make the same mistake again. We started fishkeeping last spring when my daughter’s 1st grade teacher asked us to keep the classroom goldfish over the summer. The...

Hi I have a 55 gallon aquarium that has been set up and running for almost 4 weeks now. I have now 2 neon tetras, 3 baby jelly bean parrot fish about an inch in size each, and 4 fancy guppies 2 male and 2 females , and 1  4" pleco. I had three more fancy guppies and a black moore  but they all...