Help, I really need help with a problem with my galvanized feeding trough. I purchased it one year ago from Tractor Supply and it is 50 gallon. I couldn't keep goldfish alive in it for more than two weeks. I decided it was the zinc in the water so I bought Pond Shield - non toxic and painted the whole inside. Put my Lowes Pebbles and aquarium blue rocks in it and filled it up. Bought 5 new fish to try out and they all died within three days. I have a filter systems. I tested the ph in the water and it was between 7 & 8. We are on a well and our water has rust in it so we have an elaborate filter system for the house water. Could this be the problem. I also have filter in my pond. Please tell me what to do. My husband had an ugly black ground insert tank on the porch with very healthy fish in it when we got married. I hated it and being the decorator freak I am, decided to go with the galvanized. BAB IDEA. I need your help please!!!!!!!