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Old 03-06-2015, 03:32 PM   #1
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Alkalinity chemistry question

I check my kh the other day and it was 5. I don't know how long it took to get there. After some tests it seems the tank loses .5 each day. My question is, could there be a point where the kh won't drop anymore? If it drops to 5 and you left it alone, would it be possible to drop to 2 or 1? I'm thinking the sand and rocks maybe won't let it drop further than that.
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Old 03-06-2015, 04:52 PM   #2
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well it depends on whats going on here, is your coral taking it out of the water, is that why its dropping? Your alk is the measure of carbonate in your water. Carbonate mixes with calcium to form coral skeletons. If your tank sucks it dry your corals cant grow and may die. Something needs to replace it, either water changes or dosing.
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Old 03-06-2015, 04:58 PM   #3
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Is this a coral tank? The lower the alkalinity, the more acidic the water.
You'll never be able to keep corals with alkalinity that low. I don't know the answer to your question though..I'm sure the calcium based rock and substrate may buffer somewhat.
Why not just add whatever amount of soda ash you need to keep it at say....8?
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Old 03-06-2015, 05:09 PM   #4
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Is this a coral tank? The lower the alkalinity, the more acidic the water.
You'll never be able to keep corals with alkalinity that low. I don't know the answer to your question though..I'm sure the calcium based rock and substrate may buffer somewhat.
Why not just add whatever amount of soda ash you need to keep it at say....8?
Yes, I'm taking the steps to correct it by getting dosing pumps. Some Corals started acting up a few months ago, might be the same time kh dropped
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Old 03-06-2015, 07:41 PM   #5
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My alk is always low. I usually use some of my soft coral to 'track' it if I need to dose it back up. I want to say with sand and rock it shouldn't be able to go lower than 6-7...are you sure it was 5? I never thought it could go that low.
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Old 03-06-2015, 07:52 PM   #6
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I've seen a 5 when I first got into SPS. It can happen...
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Old 03-06-2015, 09:41 PM   #7
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My alk is always low. I usually use some of my soft coral to 'track' it if I need to dose it back up. I want to say with sand and rock it shouldn't be able to go lower than 6-7...are you sure it was 5? I never thought it could go that low.
Yes, it was 5. Pretty heavily stocked with lps. No wonder some started dying. After two years I'm learning knew things. Sad I lost a few great corals. One frogspawn that split into 8 heads isn't doing well.
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Old 03-07-2015, 10:18 AM   #8
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Just manually add alk buffer in the morning, and at night when you get home from work until you get the dosing pump. BRS sells bulk additives pretty cheap.
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Old 03-07-2015, 02:50 PM   #9
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The BRS kit for dosing is pretty nice period. Though just the additive, a jug, and a pump it sure makes life extremely easy. Don't remember if it came with the measuring cup and funnel or not.
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Old 03-07-2015, 02:54 PM   #10
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The BRS kit for dosing is pretty nice period. Though just the additive, a jug, and a pump it sure makes life extremely easy. Don't remember if it came with the measuring cup and funnel or not.
Trying to see if I should use kalkwasser instead. I don't have a lot of evaporation. My ph is between 7.95 and 8.03. Is that too low? Kalkwasser scares me. Don't know how much to dose. 2 part seems more stable
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