How much water to change in 500G

  • We are currently upgrading MFK. thanks! -neo
I would bet you need more than 150g change every 2 weeks.

But since you don't test parameters then you won't know till something dies.

If it were me it would get a drip system asap. But If I couldn't do that I would change 200g water minimum per week.
 
Check the nitrate levle before and after a water change. If you can keep it less than 20PPM your OK. Lower is always better! C'mon, test kits are relatively cheap and easy to use! What's cheaper...a test kit or a tank of dead fish? !!!
 
The only way to tell if you're changing enough water is to test your nitrates. That's are reason for water changes. Everyone has their own personal limit as to how high they'll let their nitrates get. Average is about 20-40 ppm (although I think 40's too high myself). Once you reach that level-do a water change. Very simple. But you have to test. Every hobby has its own set of tools. Fishkeeping is no different and in order to do it right you have to test your water.
 
Nitrates are the only testable key to know when to do water changes.

BUT there are many reasons to do weekly large water changes.

Water changes are the ONLY way to remove metabolites and several other pollutants that are not testable.
 
Being in the saltwater hobby for the longest I have every tests imaginable on the market from nitrate to Po4 to Magnesium. One of the reasons i quit testing altogether is because most of the time I get different readings from various reputable makers. Even with the same brand kit I also get various readings. I guess Ill just continue to do large water change every 2 wks.,,.perhaps even every week.
 
hybridtheoryd16;3718540; said:
I would bet you need more than 150g change every 2 weeks.

But since you don't test parameters then you won't know till something dies.

If it were me it would get a drip system asap. But If I couldn't do that I would change 200g water minimum per week.
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I;m not sure if a drip system would do any good. It only replace evaporated water and IMHO it's not that big of a change in term of adding water. Correct me if im wrong. Thanks
 
A drip system drips new water in all the time. Its a series of filters ran in a waterline prior to it entering the tank. I've ran mine at over 1000 gallons per day. You control the drip rate. Install a drain on the tank or sump and plumb it to a drain. New water pushes old out. No more wasting your life away doing waterchanges. You're thinking of an auto top off.
 
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