High KH and GH, bad? - The Planted Tank Forum
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post #1 of 6 (permalink) Old 03-13-2014, 08:37 AM Thread Starter
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High KH and GH, bad?


I'm setting up a new 60 gallon, low tech, planted tank. I'd like to use tap water instead of RO. I live in Los Angeles and am on DWP water and tested the water today and found a KH of 7 and GH of 9. This seems higher than what other people have mentioned as their KH/GH.

Should I be concerned about my KH/GH? These are the plants I'm planning on keeping:

Lilaeopsis mauritiana
narrow leaf java fern
rotala sp green
hygrophila corymbosa
staurogyne repens

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post #2 of 6 (permalink) Old 03-13-2014, 11:26 AM
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Here's what Tom Barr (acknowledged plant guru) has to say about the use of tap water versus RO & high GH/KH
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post #3 of 6 (permalink) Old 03-13-2014, 12:03 PM
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You could post a message in the Fertilizer and Water Paramaters forum - there will definitely be someone there who can answer your question. I do know these are normally measured in degrees KH and GH and are translatable into parts per million. I add Seachem Equilibrium to my water to raise the GH to 5, so 9 is over that, 1 degree short of twice as much.

Your question was good and should be easy to answer.

MY TANK: Planted 10g; 2 x 10W CFL; Fluval U2 internal filter; MGOCPM/black sand cap

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post #4 of 6 (permalink) Old 03-13-2014, 01:35 PM
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you'll be fine. mine is 8.2PH, 7KH, 11GH, no problems

75G; DIY turtle top, Zilla T5/halogen combo, Sunsun 302, Skim350, Aqueon pro, Saftsorb
50G; Aquasun 2xT5HO, Sunsun 302, Aqueon pro, Aquatek CO2 reg, UP aqua atomizer, Saftsorb
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post #5 of 6 (permalink) Old 03-13-2014, 07:52 PM
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That is not bad at all. You might not be able to breed the softest water fish, but that water is just fine for GH and KH. Just about all the community fish sold in the average pet store will do just fine in that water.
Pretty much all the aquarium plants will do just fine, too.
There are a few specialty plants that really demand soft water (low calcium, acidic water) but I do not think your plant list includes any of these.
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post #6 of 6 (permalink) Old 03-14-2014, 07:26 AM Thread Starter
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Thank you for the guidance everyone.
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