Mistakes to Avoid Making as a Goldfish Keeper



 We all care deeply about our goldfish and want to give them the happiest, healthiest life possible. We all want to be the greatest goldfish keepers we possibly can be for our aquatic pals. While some people legitimately prefer to be ignorant about good goldfish husbandry, the majority of people sincerely care about their pets and unwittingly make mistakes that are very typical among novice and unskilled goldfish caretakers.

Mystery Snails and Goldfish: Can They Live Together?
Mystery Snails and Goldfish: Can They Live Together?

It can be simple to criticize yourself when working with a sick fish or trying to fix a mistake you made, but there’s no need to! You’re seeking knowledge and instruction, demonstrating your clear concern for your goldfish.

  1. Avoiding tank refueling

When it comes to raising goldfish, or any other fish for that matter, this is unquestionably the most frequent error individuals make. The majority of folks are used to going to the store, purchasing a bowl or tank and some fish, and then bringing everything home to get started. Science has shown us that this prevents appropriate tank cycling. The process of generating advantageous bacterial colonies inside the tank is called a tank cycle. These colonies can be found on the substrate, filter, and several other surfaces of the water-flowing tank. Ammonia and nitrite, waste products from fish and decomposing organic debris, are ingested by helpful bacteria and converted to nitrate.

2. Not Understanding Goldfish Needs

If you grew up with fish, you surely remember the process of standing in the pet store aisles, choosing adorable tank decorations, buying fish food and a heater, and then going home to get your new goldfish established. Many people are unaware of the unique requirements of goldfish. The most frequent error is keeping goldfish in heated bowls or aquariums. Since goldfish are cool-water fish, they probably won’t need a heater if their housing is in a climate-controlled space, such your living room with air conditioning and heating.

3. Selecting the Wrong Tank Companions

Many people employ the “go to the store, pick out fish” strategy when choosing fish. People ultimately chose fish based solely on aesthetics, disregarding the unique requirements of each species. Because goldfish prefer cool water and angelfish prefer warm water, if you go to the store and choose between the two species of tropical freshwater fish, one of them will have to live in less-than-ideal water conditions.

Unaware of the stress and danger it puts both fish through, which frequently results in violence and death, some people purchase both goldfish and betta fish. Selecting small tank mates for goldfish is another error that is frequently made.

4. Filling the Tank Too Much

Because we’ve been told for so long that there are “laws” pertaining to the size of the tank a goldfish should be kept in, this is a challenging question. Although there are size considerations, there aren’t any absolute laws. Many people assume that goldfish will not outgrow their habitat since goldfish do manufacture hormones that are released into the water and slow growth. Though not entirely true, this is partially true. Even if they are all still young, if you go to the store and buy eight 2-inch goldfish for your 10-gallon tank, you have overstocked the tank. They will develop and, despite the growth restriction, may get uneasy or feel the need to engage in resource competition.

You may also like to read Why Don’t Goldfish Live Longer?

5. Tank Under-Filtration

Goldfish produce a tremendous amount of bioload! Ten ember tetras will not produce as much garbage as one adult goldfish. When choosing tank filtration, a common error is made, and it is simple to see why.

You could assume “near enough” if you see a filter that is rated for a 50-gallon tank but you have a 55-gallon tank.

You’re probably right about low bioload producers. You are undoubtedly incorrect with regard to goldfish. If you keep one or two goldfish in a tank, the filter should be sized appropriately for the tank. A filter that is rated for a tank larger than the one you have is necessary if your tank is overstocked.


Being a goldfish keeper makes mistakes very simple. The practice and understanding required for proper husbandry can take some time. If you discover a mistake you’ve been making, don’t be hard on yourself. Learn from the experience, fix the issue, and continue. Not only is this the finest thing you can do for your own mental and emotional well-being, but it’s also what’s best for your goldfish and the local community of goldfish keepers.


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