EI on a large tank - The Planted Tank Forum
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post #1 of 5 (permalink) Old 05-31-2005, 12:42 PM Thread Starter
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EI on a large tank

Ok I understand the EI Thing.

Makes a lot of sense. Keeps all Nutrients in abundance without the need for testing BUT........

I have a big tank (175G) and doing a 50%-75% water change is a big deal and takes a lot of time. So my question is two fold
1) Any advice on managing nutrient concentrations on large tanks without the need to WC
2) Any experience with EI on a large tank and making the WC thing less of a pain in the ...

Feeling Lazy Aquarist.
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post #2 of 5 (permalink) Old 05-31-2005, 12:56 PM
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I have a 125 planted and I've been using the EI method. I use a python and it doesn't take more than a few minutes. I fill straight into the tank which I was nervous about at first but all the fish are fine. There was just a thread on water changes if you want some more ideas.
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post #3 of 5 (permalink) Old 06-01-2005, 01:29 AM
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I built a water changing aid.


It works well for both emptying and filling the tank. You could build a couple and go from there. I can drain ~25 gallons of water from my 55 gallon tank in about 10-12 minutes using gravity and a hose.

Filling takes a bit longer due to the use of a smaller hose and low water pressure.
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post #4 of 5 (permalink) Old 06-01-2005, 04:12 AM
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I was just about to suggest building what Rex uses, but he beat me to it. Water changes on my 85gal are going to take a while so I plan on building a similar device. It sure beats just leaving the Python hose in there and worrying about sucking up a fish....

As for refilling, it's not a problem so long as you add your dechlorinator/conditioner during the refill process.

You -could- do smaller water changes, but you'll have to test your NO3/PO4 levels more frequently to ensure you're not getting too much of a build up.

- Erik
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post #5 of 5 (permalink) Old 06-05-2005, 08:36 PM
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If you want to avoid work, get a smaller tank or use the monkey brains we all have and put it to use.

A simple device as shown above will work fine, large diameter drain hoses, automatic water changers, Python styled water changers are a snap.

I use a simple drain valve hard plumbed to a 350 gal tank, I can change and refill 200 gal in about 1 hour.

I can trim while draining and refilling an clean the glass.

I spend about 2 hours total on the tank a week, that's it and it's got high maintenance plants, aquascape.

But if you prefer, there is no reason you must do 50% weekly water changes, it's merely a baseline for folks having issues, but you can do less and dose a bit more conservatively and use the plant's health as the indicator you need to add more.

You can do 25% weekly, or 50-70% once every 2 weeks etc.
That is up to you ansd what works for your habits.

I greatly prefer having the option to do a large water change easily.
Make the water change easier and faster.

Automatic water changers also work well.
I prefer easy manual changes. A large diameter drain hose to outside or a drain, and a simple refill hose attached to a bath faucet is simple enough, add a valve to shut off near the tank.

You are done.

Should take about 1 hour or less to do the tank and you can clean and trim during that time.

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