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Old 05-12-2011, 06:32 AM   #1
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Dumb water change question

Sorry if this has been asked a million times but I couldnt find a definitive answer.

Advice on this site seems to suggest a pwc of 10-15% per week at least in the early days.

I got to wondering if this means.........

1. 10-15% is the bare minimum you should do to keep your tank healthy, but you could change upto ??% and that would be great because???

2. you should never change more than 10-15%, if you do there are dire consequences that are???

Many thanks for taking time to read this.
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Old 05-12-2011, 06:45 AM   #2
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Originally Posted by Ethreal
Sorry if this has been asked a million times but I couldnt find a definitive answer.

Advice on this site seems to suggest a pwc of 10-15% per week at least in the early days.

I got to wondering if this means.........

1. 10-15% is the bare minimum you should do to keep your tank healthy, but you could change upto ??% and that would be great because???

2. you should never change more than 10-15%, if you do there are dire consequences that are???

Many thanks for taking time to read this.
Well that really depends if u are overstocked and wat filter u have.
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Old 05-12-2011, 07:07 AM   #3
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Thanks for the quick response. Water change has been done every 7 days. The tank is an Orca TL550 (128 litres) and I have been changing 20 litres per week, so just a little over 15%.

  • 128 Litres/28 Gallons
  • L570mm x W510mm x H670mm
  • 2 x 24w T5 Compact lights + Cooling fans + Moonlight LEDs
  • 720lph Return Pump
  • Skimmer
  • Heater
  • UV Steriliser
I replaced the plastic balls with LR rubble and added another ph otherwise the setup is as above.

Stock is

2 x Tangerine Clowns
1 x Flame Angel
2 x Trochus Snail
1 x Orange spot snail
2 x cleaner shrimp
4 x soft corals
30lb LR + LR rubble in the filter.

I use RO water from the LFS.

Amonia = 0
Nitrite = 0
Nitrate = 12.5ppm - This never seems to reduce following a water change.
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Old 05-12-2011, 06:52 PM   #4
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I do at least a 20% pwc every week on all my tanks. I've just managed to get my nitrates down to 0 after many months of trying.

Do you find your skimmer getting anything good? It's supposed to remove organic particles which I think would be very helpful on top of the water changes.
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Old 05-12-2011, 07:17 PM   #5
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Carey thanks for the reply, the skimmer is full of yucky water and particles and I empty it each morning.

I will up my pwc to 20% - at the moment I just dont see any reduction in nitrate pre and post pwc, I guess it could be that a 15% reduction in 12.5ppm is just too small to register on my test kit using red sea marine labs or tetra for nitrate testing = poor choice perhaps.
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Old 05-12-2011, 07:27 PM   #6
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I use salifert tests for my nitrate, very very accurate and goes down to like .10 or something silly like that . LOL

I would bet you'll see some reduction if you up the % of pwc. Youre probably right about the concentration.
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Old 05-12-2011, 07:53 PM   #7
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All good advice, though each tank is different. That's why testing your tank often and knowing exactly what goes into it is important. Journaling even.

I would caution you on the flame angel. IME, they need a tank with more swimming room. Also, I've never seen an old reef safe angel. They all seem to turn suddenly one day. Watch for your zoas to stay closed more often.
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Old 05-12-2011, 08:11 PM   #8
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I've never seen an old reef safe angel. They all seem to turn suddenly one day. Watch for your zoas to stay closed more often.
You are right about that. Mine went 4 yrs before it started munching.
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Old 05-12-2011, 08:39 PM   #9
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You just need to watch your water quality. If nitrates get 15 or greater i normally end up doing a change (about every week and a half for me). If you have a reef tank you would want nitrates to be as low as possible i just have FOWLR
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Old 05-12-2011, 08:45 PM   #10
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And dont think that asking a question is dumb! the people on this forum want to help and see you succeed in the hobby!
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