Hello and "Happy Wednesday". Today we have a 75 and 100 gallon tank to do. We'll remove and replace roughly half the tank water in both. The 75 has Guppies and Platys, but not many for 75 gallons of water. The 100 has a dozen fairly large Goldfish of different colors and patterns. The Goldfish are all around 6 years old and from three to six inches long, give or take a little. The 75 has a single sponge filter and the 100 has three. Those Goldfish need a little more filtration, because they're such heavy waste producers. Feeding must be minimal if you hope to keep the water clean enough for any fish. Even a trace of nitrogen in the water is enough to weaken a fish's immune system and allow the bad bacteria that lives in any tank to infect them. This is why I preach the benefits of large, weekly water changes.
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