Tropical Fish Keeping banner

1 - 20 of 21 Posts

·
Registered
Joined
·
89 Posts
Discussion Starter #1
Are they really necessary? When I have my180 going a 25% daily would be crazy.
Posted via Mobile Device
 

·
Registered
Joined
·
5,201 Posts
  • Like
Reactions: SeaHorse and Tolak

·
Registered
Joined
·
690 Posts
You should only need to do 50% water changes if you've got a cycling problem, or with some medications. You'll also come across this with certain breeding situations, but for a reasonably set up & stocked cycled tank it would be excessive.
 

·
Administrator
Joined
·
9,804 Posts
My guess is that you're looking at betta fish threads. Typically, the people who keep bettas in 1 gallon or less need to do pretty frequent water changes.

But for a larger cycled tank with zero ammonia & nitrIte and nitrAtes in a good safe range it's certainly not necessary. 25% to 30% a week depending on your stocking level is a pretty good rule of thumb.
 
  • Like
Reactions: SeaHorse

·
Member
Joined
·
454 Posts
I do 50% per week, but I have messy goldfish. I just left a shop that hasn't done a water change in 2 months on a 180 with discus. And the water and tank were crystal clear. You could barely see the water.
 

·
Registered
Joined
·
5,201 Posts
In my experience frequency of water changes has little to do with water clarity. Clarity is more a function of filtration.
 
  • Like
Reactions: keepsmiling

·
Member
Joined
·
454 Posts
Well if they were mine I would have been changing the water. I don't think I have ever not changed water in two months...*gasp*
 

·
Registered
Joined
·
5,201 Posts
I have - clarity was completely unaffected.
 
  • Like
Reactions: keepsmiling

·
Registered
Joined
·
840 Posts
I've only ever done daily water changes when there is a problem but I do change 25% every week in all my tanks. Do you thonk that's too much or unnecessary?
 

·
Registered
Joined
·
5,201 Posts
I think that's just fine. You can always do more if you think it's necessary.

For me, I don't do any less than 50% changes. If it's been a couple months, 50%. If it's the usual month or so, then I change about 80%.

I believe it's important to do a massive change periodically, if you normally do small changes. Small changes don't clear out the water like large ones do.
 
  • Like
Reactions: rsskylight04

·
Super Moderator
Joined
·
3,247 Posts
Monitor the Nitrates in the tank, your aim when doing a water change is 24 hours later to reduce them to half of what you tested prior to the change.

What filters are you using on the 180g tank. In my 75g I can get away with not doing a water change for 2 weeks, although I do a 50% change once a week. When changing water, you are not only helping to reduce nitrates but removing other unwanted things in the water. One being pheromones that the fish produce to potentially attract a mate.

In a large tank, you can slightly reduce the water change schedule but I would not do less than 50% per month.
 

·
Registered
Joined
·
89 Posts
Discussion Starter #15
Monitor the Nitrates in the tank, your aim when doing a water change is 24 hours later to reduce them to half of what you tested prior to the change.

What filters are you using on the 180g tank. In my 75g I can get away with not doing a water change for 2 weeks, although I do a 50% change once a week. When changing water, you are not only helping to reduce nitrates but removing other unwanted things in the water. One being pheromones that the fish produce to potentially attract a mate.

In a large tank, you can slightly reduce the water change schedule but I would not do less than 50% per month.
I have order a sump system and 950 gph
Posted via Mobile Device
 

·
Registered
Joined
·
319 Posts
every tank has it's own requirements... like shoes, one size does not fit all.. a water change schedule needs to be tailored to your individual tank and it's inhabitants... the amount of stock, plants and type of plants and stock all make a differance.... personaly for my tank, a 15% water change once every 10 days seems to work in keeping the NitrAte levels < 20 PPM...once you find ( through testing) what works best you can tailor your water changes to match...
 
  • Like
Reactions: rsskylight04

·
Reference Team
Joined
·
1,573 Posts
Daily water change is generally discus keeping advice. They need more water changes then your average fish.
Almost all of my tanks get 50-70ish% per week. To me the percentage I do makes no difference in effort other then leaving the hose hooked up longer. But every tank definately has different needs. Where all my other tanks are perfectly fine going a month without a water change i wouldnt ever go that long with my african tank. My African cichlids really do need perfect water quality to thrive and means little to no nitrates.
 

·
Registered
Joined
·
5,201 Posts
Many of the discus keepers that change the water daily believe that they are reducing growth inhibiting hormones released by the fish, thereby maximizing the fish's growth.
 

·
Registered
Joined
·
840 Posts
water testing

I read somwhere in the threads that water changes should be done as a result of water testing, not according to a time schedule. I think I agree,but what about those other things in water that are not measured by water test kits? Pheremones, stress hormones... . I think I'll keep to my weekly changes for now, but always learning more and willing to adjust to new knowledge.
 

·
Reference Team
Joined
·
1,573 Posts
I read somwhere in the threads that water changes should be done as a result of water testing, not according to a time schedule. I think I agree,but what about those other things in water that are not measured by water test kits? Pheremones, stress hormones... . I think I'll keep to my weekly changes for now, but always learning more and willing to adjust to new knowledge.
Well yes and no. Thats waiting for your tests to show a number you dont like before you correct it.
It would be interesting to see how long before hormones in your water effected your fish. I wouldnt really want to find out that way but it would be cool to know.
 
1 - 20 of 21 Posts
Top