The more you feed or the more fish in the tank the more often you need to do water changes with goldfish. I use to do mine weekly because I had more big ones. They are slowly dying off here and there, so my bioload is lower now so I go 10 days.OK, I will do that. I used to change the water twice weekly but kind of got lazy on that the past couple of years.
I like goldfish because they are simple and generally can handle large water changes. Tropical fish can be more touchy.
 
	 
 
		 
			
		
		
		
	
	
			
		 
			
		
		
		
	
	
			
		 
			
		
		
		
	
	
			
		 
 
		

 
 
		

 ).  He called me to tell me that there was a blue ring around the toilet bowl that he had never seen before.  He researched this, and learned that it means there is HIGH COPPER content in the water!  So, I ran a water sample to the aquarium store near us that specializes in specialty fish.  They ran several tests on the water.  The owner came to tell me that the water had the highest copper content he had ever seen in a fresh water tank!  He said he didn't know why it was so high lately,, ....but anyway, he said he had no doubt that we've always had copper in the water and he said that's what killed our older fish for sure, because the copper builds up over time, and it, among other things, slowly destroys their immune systems.  Anyway, the nitrate was also high, as we knew.  So they sold me this emergency treatment stuff for the tank, called Cuprisorb.  It is not cheap, but it does quickly absorb copper and heavy metals from the water.  The problem is that everything in the tank absorbs copper too and it will leach back out into the water.  So the only permanent solution is either reverse osmosis or another water source.  I can make the cuprisorb last for a month or so, then I suppose we will have to start looking at R.O.  WE are going to test the water again in two weeks, and do a few more big water changes.  I did one again tonight and BG the old goldie does look and act like she's feeling a little better since I did.  She laid on the tank bottom all day today, but now she is swimming and having a snack. Just thought i'd pass this along.
).  He called me to tell me that there was a blue ring around the toilet bowl that he had never seen before.  He researched this, and learned that it means there is HIGH COPPER content in the water!  So, I ran a water sample to the aquarium store near us that specializes in specialty fish.  They ran several tests on the water.  The owner came to tell me that the water had the highest copper content he had ever seen in a fresh water tank!  He said he didn't know why it was so high lately,, ....but anyway, he said he had no doubt that we've always had copper in the water and he said that's what killed our older fish for sure, because the copper builds up over time, and it, among other things, slowly destroys their immune systems.  Anyway, the nitrate was also high, as we knew.  So they sold me this emergency treatment stuff for the tank, called Cuprisorb.  It is not cheap, but it does quickly absorb copper and heavy metals from the water.  The problem is that everything in the tank absorbs copper too and it will leach back out into the water.  So the only permanent solution is either reverse osmosis or another water source.  I can make the cuprisorb last for a month or so, then I suppose we will have to start looking at R.O.  WE are going to test the water again in two weeks, and do a few more big water changes.  I did one again tonight and BG the old goldie does look and act like she's feeling a little better since I did.  She laid on the tank bottom all day today, but now she is swimming and having a snack. Just thought i'd pass this along. 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		
 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		 
 
		