Good WaterChange Schedule w/o Any Equipment

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TimaT

Aquarium Advice Activist
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Jun 15, 2012
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What do you think would be a good waterchange schedule without any dosers, skimmers or other equipment on a reef tank. Just simply relying on waterchanges.

weekly % ?
 
lets say its a 6' 200gal tank. anyway, i know it depends on what you keep. but i want a general answer. lets say its a mixed reef with about 20fish. mostly anthias and chromeses.
 
20% a week would definitely do the job but might be overkill unless you have a big bio load or a lot of sps. I think 10% per week is a good rule of thumb but as stated it depends on the setup.
 
Either would work on a normal biolad. If you had a heavy bioload then the twenty would be needed.
 
I have a 6 foot tank and the amount of skimmate I get in a week is pretty astounding. If you wanted to bypass the skimmer as you said above then yeah, I would go with 20% weekly to be sure. The skimmer can help immensely with water changes as it gets out alot of organic stuff. I keep a lightly stocked mixed reef in my 125g and do about 60% water change every few weeks. This keeps the parameters in check but not perfect. ANd again, I only have a half dozen fish right now. It also depends on the corals you keep, I have very easy ones so they are not gobbling up the elements as quick as SPS or a montipora cap might. In my opinion it really depends on what you are keeping.

As for the expense, I go through say 200g of water a month at least, and thats just with water changes and not top offs. I have my own ro/di and mix my own I/O salt so that helps alot.
 
Here's a basic run down on the feeding process.
You're going to add protiens to the tank, including nitrogen and phosphors, in the form of food. You'll add a certain amount weekly.
The fish and bacteria will convert that to different forms of protiens, but still protiens. Phosphates and nitrates will be end form and could be measured in a weekly addition amount measured in ppm depending on the bioload and feeding habits.
You are proposing on doing a weekly water change of 10 or 20% weekly. That means you'll remove 10 to 20 % of the weekly addition of nitrates and phosphates. Or more simply stated, you'll be leaving 80-90 % of the weekly addition of nitrates and phosphates in the tank. What is your plan for the huge amount of left over protiens you'll leave in the tank? FYI algae LOVE protiens. Cyano especially.
If you don't do something other than water changes, your nitrate and phosphate levels would slowly increase until the 10 to 20% removed is equal to the amount added weekly and would probably be in the 80-100 pmm range. At least, that is whaty mine go to until I added a sump, skimmer and cheato ball. Now its 0.
 
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