50% weekly water changes safe for fish? - Tropical Fish Keeping - Aquarium fish care and resources
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post #1 of 7 Old 12-28-2008, 12:30 PM Thread Starter
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50% weekly water changes safe for fish?

I am going to start a planted tank and will be using EI dosing which requires 50% weekly water changes. I am used to changing about 25% weekly but 50% seems pretty high.

Wouldn't it be kind of rough on the fish?

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post #2 of 7 Old 12-28-2008, 06:39 PM
a max of 20% each 2 weeks or 10 % each week is sufficent (unless you are having a water quality problem) if EI dosing requires 50% then I personally would not use it. plants do not like "new" water nor do they require it. an aged tank is ideal. what piqued your interest in EI dosing?
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post #3 of 7 Old 12-28-2008, 06:44 PM
Depending on water quality and fish kept, 25-50% is fine.

For example, a lightly stocked tank 10G tank with only two to five small fish can have 25%. But a 10G tank that is heavily stocked or with fish that are messy (Puffers, Goldies, etc), should have 50%.

But I know nothing about EI dosing. But as stated, 50% should not be too hard on the fish.
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post #4 of 7 Old 12-28-2008, 08:04 PM
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50% no problem for fish. Not sure about plants though.

150 Gallon - Mostly American Cichlids
135 Gallon - Angelfish Community
75 Gallon - Odd couple (Polleni/Angelfish)
55 Gallon - African tank
20 Gallon Long - QT
10 Gallon - Empty
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post #5 of 7 Old 12-29-2008, 09:13 AM Thread Starter
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post #6 of 7 Old 12-29-2008, 09:22 AM
As long as the new water is the same pH, temp, and hardness I don't see why it would affect the fish. Actually, you'd probably have very low nitrates which is good for your fish. I can't be sure about the plants though, I'm no expert and am just happy when mine grow!

20 gallon long: 3 adult Neolamprologus similis + about 11 fry of various ages; low light planted tank
20 gallon long:2 freshwater dwarf puffers (Puff Puff and Poofer); medium-light planted tank
10 gallon: 1 male betta named Wormy; low light planted tank
10 gallon: 1 male betta named Dante; low light planted tank
2, 5.5 gallon tanks that are currently empty (I see more fish on the horizon )
Kim is offline  
post #7 of 7 Old 12-29-2008, 09:32 AM
You should only be doing 25% at the max, i would do about 15%, unless your water qualityis really bad, then do more
fishman09 is offline  

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