can i do a 75% w.c on my 20 gallon?

[strollo22]

I don't wanna be takin out the python everyday lol, I was thinkin 1/3rd every 3 or 4 days

Then use seeded bacteria from the filter on the 125. Then you can change as much water as you want. You can only do small water changes while the tank is cycling or else it will never cycle properly


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[Bobears]

Good breeders change 100-200% a day on fish farms. As long as your ph, hardness, and temp are close change all you want. Your main goal is nutrient export or to remove nitrates. I use to change 75% three times a week for discus. Really though it all depends on what works for your tank. I'm not really sure how much it "messes" up a cycle. I'd like to see some research that says it does.

 

[Miguel]

That can be done via a constant flow and out flow.

Not, in my experience in a typical wc procedure, changing 75% of the water in 10 minutes.

I am just giving you my forty + years in the thing....not saying i am right and i will not go look for scientific evidencd..

I am a lawyer. I hate scientific evidence

 

[tiger15]

Good breeders change 100-200% a day on fish farms. As long as your ph, hardness, and temp are close change all you want. Your main goal is nutrient export or to remove nitrates. I use to change 75% three times a week for discus. Really though it all depends on what works for your tank. I'm not really sure how much it "messes" up a cycle. I'd like to see some research that says it does.

Me too. I routinely do 75% wc in my tanks and my fish love it. If your tap water is chlorinated, just make sure you place ample (I use double the recommended dosage) dechlor before you fill the tank from the tap. The chlorine level in your tap water can fluctuate and you want to put more declor than sorry to safeguard against unexpected spike in chlorine level from your water company.

It's true that small but frequent WC is best for the fish. But I am lazy and prefer to do less frequent but large volume wc. Half the work in a wc is to set up the equipment, so doing a larger wc is just a small incremental work.

 

[livebearerfreak]

to instantly cycle your tank, add filter media/decorations/some gravel/sand from an Established tank

 

[Bobears]

That can be done via a constant flow and out flow.

Not, in my experience in a typical wc procedure, changing 75% of the water in 10 minutes.

I am just giving you my forty + years in the thing....not saying i am right and i will not go look for scientific evidencd..

I am a lawyer. I hate scientific evidence

The tanks I've seen do it in about 5 minutes. But I agree, scientific evidence is way overrated And I love being wrong, just ask my wife

 

[Bobears]

Me too. I routinely do 75% wc in my tanks and my fish love it. If your tap water is chlorinated, just make sure you place ample (I use double the recommended dosage) dechlor before you fill the tank from the tap. The chlorine level in your tap water can fluctuate and you want to put more declor than sorry to safeguard against unexpected spike in chlorine level from your water company.

It's true that small but frequent WC is best for the fish. But I am lazy and prefer to do less frequent but large volume wc. Half the work in a wc is to set up the equipment, so doing a larger wc is just a small incremental work.

Most of the time chlorine gasses off during your water change. What doesn't leave is chloramine. Dechlorinators can unbind the ammonia which will make your ammonia test show a false high level. Again, depending on your tank, I will argue the small water change thing when it comes to nutrient export.

 

[koltsixx]

Good breeders change 100-200% a day on fish farms. As long as your ph, hardness, and temp are close change all you want. Your main goal is nutrient export or to remove nitrates. I use to change 75% three times a week for discus. Really though it all depends on what works for your tank. I'm not really sure how much it "messes" up a cycle. I'd like to see some research that says it does.

Not trying to be wise just curious do you mean they change all their water twice a day(200%) and how. I was always under the impression farms are usually pond systems or race systems with a constant drip system in place if that. Just curious about where you got your info as your post made me genuinely curious about how they do it as I thought I had a general idea but never gave it much thought whether they do actual water changes til your post.

to instantly cycle your tank, add filter media/decorations/some gravel/sand from an Established tank

The OP stated that the water is from his 120 gallon tank and in previous threads asked about moving filter material etc. so he's probably has done so assuming he took the advice he's already been given. His question was about water changes not establishing a tank which was the focus of his other threads.


OP while I applaud those who do large water changes overall I think small water changes many times a week are better(just my opinion) 35% 2-3 times a week I believe is sufficient in most cases unless your over stocking. I prefer small water changes to cause the fish as little stress as possible as changing larger amounts will inevitably take longer, lower water levels to a stressful degree during the change out and subjects them to your intrusion to a more severe degree in their environment for an extended period. Again it's just my opinion and how I logic it out, as my logic could be flawed I only offer it as an opinion.

 

[livebearerfreak]

water does not hold any BB itself, its the gravel/decor/filter media.... and doing 75 percent water change on your 20 gallon ( if you didnt add anything i mentioned in my earlier post ) would make your tank go into another cycle. would only leave 5 gallons of water in your tank...

 

[jagsandpits]

I put 2 plants and water from my 125, new gravel tho, I mean it seems to be cycled I am gonna chill with the waterchanges but like I said im getting 0 ammonia 0 nitrite soooo yea....... and my green terror is outrageously active (ive never seen a fish so active)