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Old 03-30-2013, 07:28 PM   #1
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if I top up 20% of my tank capacity each week, do I need to change water?

I recently got a mature nano 10 gallon tank from an enthusiast. I noticed that in my apartment the water (open top, good flow) top up is coming to about 6-7 liters a week or about 1.6-1.8 gallons. That's more than the 10% water change per week that's recommended. If I'm topping that much, how often should I change water?
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Old 03-30-2013, 07:31 PM   #2
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Yes, you should still do water changes because the fish waste is not evaporating.
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Old 03-30-2013, 07:32 PM   #3
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I have a 60 gallon and change 10g every week.
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Old 03-30-2013, 07:49 PM   #4
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Top-off are not water changes...... And you are topping off with fresh (unsalted) RODI water, correct??
Top-offs only replace the evaporated water to maintain proper salinity. Water changes remove waste from the system and replenish valuable nutrients to the water column that are consumed by corals.
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Old 03-30-2013, 10:14 PM   #5
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Yup. ok. that makes sense. I'll keep doing water change. I read on a magazine site some people do 100% water change in their nano tanks. I have no fish (yet) in it. mostly crabs and snails and some tiny corals.
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Old 03-31-2013, 11:51 AM   #6
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With just snails & crabs, you have some bioload, but very little.... a 10% weekly water change should be plenty.
Do your research carefully before adding fish..... there is a very limited assortment of what can comfortably fit in a tank that small. Probably going to be a small goby, and that's about it....
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Old 03-31-2013, 10:50 PM   #7
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Thanks. I'm not ready to add fish just yet. I think I'll be adding more corals though. The anemone and crabs are keeping me busy Emerald crab loved the boiled spinach I put in the tank.
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Old 03-31-2013, 11:50 PM   #8
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Keep a very close eye on your corals. No flat crab is truly reef safe, it's just that the emerald is the least evil of them. If it does get a penchant for coral, you'll need to remove it. There are a bunch of stories on here of people having emeralds for many months with no problems, then all of a sudden it takes to eating a whole bunch of zoas or other soft, fleshy corals.
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Old 04-01-2013, 10:20 PM   #9
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Darn really? were they feeding the crab? give it vegies fruits seaweed or just letting it scavange for left over fish food?
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Old 04-01-2013, 10:22 PM   #10
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Do I need to have a fish in a nano when there's anemone, corals and crabs?

Someone asked if I had any bioload in my nano and I said anemone. They thought I still need fish in there. This is a mature 10 gallon nano. I did have fish before, now just the anemone. Thoughts?
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