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So we started a new aquarium for my son about 3 months ago. 4 glofish and they lived very well. This past monday my wife decided to do a huge cleaning. All the plants, gravel, filter everything was cleaned. I know big mistake. Those fiah died the day after that ckeaning. We bought all new fish, and two of those died, and two more don't look good. I assume this is the nitrogen cycle starting? Is there anyway to help the 3 fish left? Just water changes with prime? Thanks in advance!