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Old 12-06-2006, 11:10 AM   #11
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Re: PWC and when to do them?

Quote:
Originally Posted by grimes135
Currently i am doing partial water changes of 15% every two weeks. i only have one fish right now so my nitrAtes stay at zero.i have heard that partials were only necessary to remove nitrates are there other beneficial factors to doing them? Can i stop doing them until i get readable levels of nitrates?
I read the "moron" part too - -

If 15% is comfortable in terms of amount of water moved etc, keep it up. If you're comfortable moving more water, you could stretch it out some (try 25%/month)
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Old 12-06-2006, 11:17 AM   #12
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With a 135 gal tank 25% is roughly 33 gal. My back hurts just thinking about having to move that much water

grimes, I hope you bought a good 30+ gal storage tank (or trashcan) and pump/hose to reduce all that heavy lifting.
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Old 12-06-2006, 11:54 AM   #13
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I use a dolley to move my water, but I'm just lazy!
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Old 12-06-2006, 02:48 PM   #14
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Wow thanks for all the responses. i have a 40 gal trashcan with two powerheads that i use for circulation and a heater. i am always very careful about making sure that the ph temp and salinity are correct before i do it. And yes i have a ten gal quarantine set up. i had the lfs quarantine my first fish for me for about 3 weeks (i know the owner). i believe kent or someone make trace elements additives. does any one have any experince with these? is there any test that you can do to determine the levels of these trace eleents? sorry about all the questions. i love this hobby and my new fish, he is doing GREAT! so i dont want to mess that up. thanks
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Old 12-06-2006, 03:02 PM   #15
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Doing pwc will provide most of your trace element replacement needs. You could spend a couple of hundred (maybe thousands) on Salifert test kits to test the majority of trace elements but really the only ones you really want to keep an eye on are ca, mg, alk, and that's only if keeping ca loving corals.

The main rule to follow is to never add any additives you don't test for to keep from overdosing.

Only thing I ever add is C-Balance to keep my ca at 400 ppm.
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Old 12-06-2006, 03:09 PM   #16
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thanks for the advice, makes sense to make sure that you can test for what you are adding so you dont overdose. now i hope that i am not opening up a can of worms here but when using RODI water like i am are all of the trace elements still in the water or have they been removed in the filtration process? Thousands of dollars for testing supplies are a little out of my price range. since i am not doing corals would you still recommend a calcium additive? thanks again
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Old 12-06-2006, 03:17 PM   #17
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ro/di is for filtering tap water before you add your salt so the only thing it removes is any impurities from the tap. Tap water has minerals but most are harmful not helpful to aquariums.

Trace elements are blended in with salt mixes.

The common brands are fine for fo/fowlr like
Instant Ocean, Oceanic, & Red Sea.

Higher quality salts recommend for reef tanks like Tropic Marine Salt, Kent Sea Salt, & Crystal Sea Marinemix are better formulated to more closely mimic the ocean's true trace elements.

If fowlr I'd still keep your ca at 400 ppm which helps coralline algae and some inverts.
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Old 12-06-2006, 03:18 PM   #18
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I wouldn't worry about calcium, if you are not doing reef. I also think folks may add that, possibly since their coral bioload depletes the natural calcium in their tank, rather quickly.
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Old 12-06-2006, 11:09 PM   #19
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ok that makes sense about the coral depleting that calcium in the tank. i will get a calcium test kit regardless, so i can keep an eye on it.

What is the optimal amount and frequency of partial water changes? i assume that there is no optimal level but if you could just give your opinion or what you do. Please ignore constrains and things like time it takes to do water changes and production time of RO water. I am just trying to understand the theory behind it so i can do the best job that i can. thanks
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Old 12-07-2006, 11:13 AM   #20
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Quote:
Originally Posted by grimes135
What is the optimal amount and frequency of partial water changes?
That mostly depends on how much of a bio-load (size/amount of fish/coral/inverts) is in the tank.

A lightly stocked tank can get away with 10%-15% pwc a month where as a heavily stocked tank could require 20+% pwc weekly.

Other factors like feedings, clean up crews, and filtration methods also need to be considered.

For an average stocked tank I'd recommend 10-15% pwc weekly to dilute pollution and replenish trace elements and for overall tank health.
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