First ah stops swimming for times

Sam12

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My fish which I’ve had for over 18minths is just staying still at the top or bottom of the tank for a while and then continues in swimming around. He looks more red than usual. Any clues?
I’ve added new plants from my friends pond and maybe they’re not working for them
 

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My first concern would be the chunky rocks on the bottom. They could trap a lot of uneaten food and wastes. With goldfish, prodigious poopers, I would be concerned. Hopefully, with a goldfish you've been doing large, 40% weekly partial water changes, but even with that, your substrate is a time bomb that could be ticking now.
 
When was the last time you changed the aquarium water ?
 
Welcome to the club !!!

If you take the time to give us a good insight on your setup, The way you run it... Details on your processes...

Since aquaria is a very complicated hobby, That can be taken Very seriously and Very lightly and still work at the same time. "It is, what it is" like we say over here. To be honest simple questions brings simple answers.

Lets say you have a question like "my printer is not spooling documents ?" on a computer support site. You are going to get plummeted with questions...

In Aquaria, Forums members are not going to really start to investigate you like that...

But, a good exposition of your current status... Will surely invite truly insightful responses from higher knowledgeable members...

Who always looks like they are waiting for someone to respond something stupid before intervening... But at some point you have to assimilate that everybody is doing that on their own time and are intervening from acquired knowledge and are willing to help and do so with experienced confidence.

And are still able to tolerate infringement to their holy rules without flaming everyone... Enough about social media.

You have to provoke interest.

Getting to the point... To create interest with advanced aquariophyle, You need to provide some information.

I used AI to p* this and reviewed it to reflect my convictions. Pre-answering these questions. could bring common problems excluding illnesses to straight enlightened answers almost immediately. I left the obvious AI quoted observations

. Tank Basics:

"What size is the aquarium in gallons or liters?" (This helps determine stocking capacity and filter needs.)
"How long has the aquarium been set up?" (New tanks often have cycling issues.)
"What type of filter are you using?" (Helps assess filtration effectiveness.)
"What type of substrate do you have?" (Some substrates can affect water parameters.)
"Do you have live plants? If so, what kind?" (Plants influence water chemistry.)
"What type of decorations are in the tank?" (Some decorations can leach harmful substances.)
"What type of lighting do you have, and how long is it on each day?" (Light affects algae growth.)

2. Water Parameters:

"What are the current water parameters? (Ammonia, Nitrite, Nitrate, pH, KH, GH)" (These are crucial for diagnosing many problems.)
"How often do you perform water changes, and how much water do you change?" (Water changes are vital for water quality.)
"What type of water do you use for water changes (tap, RO, etc.)?" (Tap water may have issues.)
"Do you use any water conditioners or treatments?" (Some treatments can cause problems.)
"How do you test your water parameters?" (Accuracy matters.)

3. Livestock:

"What type of fish or invertebrates do you have, and how many of each?" (Stocking levels are essential.)
"How long have you had each of the fish or invertebrates?" (New additions can introduce disease.)
"Have you added any new fish or invertebrates recently?" (Quarantine is important.)
"How often and what do you feed your fish or invertebrates?" (Overfeeding is a common issue.)
"Have you noticed any changes in the behavior or appearance of your fish or invertebrates?" (Symptoms are key.)

4. Symptoms and Observations:

"Are you seeing any algae growth? If so, what type?" (Algae can signal imbalances.)
"Are any fish gasping for air at the surface?" (Indicates oxygen problems.)
"Are there any unusual smells coming from the tank?" (Can indicate decay or bacterial blooms.)

5. Recent Changes:

"Have you made any recent changes to the aquarium, such as adding new decorations, plants, or fish?" (Changes can trigger problems.)
"Have you recently used any medications or treatments in the aquarium?" (Medications can disrupt the cycle.)
"Have you cleaned the filter recently? If so, how?" (Improper filter cleaning can crash a cycle.)

If you discuss of a tank problem with anyone that doesn't know anything about you, at least one # of these questions should be at least partially assessed in the question as relevant to the problem involved.

Without being rude. "My fish lies on the bottom" is only going to start a ping pong game. Tank basics and Water parameters are minimal for anyone outside the bubble to have any idea of what is going on.

#3 has good impact while I left #4 to the tank startup only thing as it can include the whole panoply of possibilities.

I know... You're the victim of an old f** rant... But don't feel like it... It's not your fault... It's all the others before, that dropped a post like yours and disappeared.

And since it's your first post, I'm feeling even more sorry for that. but had to blow a litlle steam out.
 
Check the water quality for ammonia, nitrite, nitrate and pH.

Do a 75% water change and gravel clean the substrate every day for a week.
Make sure any new water is free of chlorine/ chloramine before it's added to the tank.

Clean the filter if it hasn't been done in the last 2 weeks. Wash filter media/ materials in a bucket of tank water. Tip the bucket of dirty water on the lawn outside and re-use the media.

Make sure the goldfish gets plenty of plant matter in its diet.
 

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