Crushed corals loses its, um, 'strength'? - The Planted Tank Forum
 
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post #1 of 7 (permalink) Old 09-16-2005, 04:33 AM Thread Starter
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Crushed corals loses its, um, 'strength'?

I've got really soft water (1dKH) and used 2tbsp of crushed coral in the canister to increase it. This increased my KH to about 3.5-4, which was great. But I measured my KH recently and it has dropped to 2dKH. Does corals gradually lose their 'strength'? (I'm sorry, I don't know what's the word to use here! )

Do I need to replenish these 'spent' corals with a fresh batch?
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post #2 of 7 (permalink) Old 09-16-2005, 04:43 AM
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Maybe you tested your water after a big waterchange?; and maybe the coral hasint had time to leach into your water collum? Try testing your water's kh at the same intervals every week, and don't test water for a couple days after a waterchange... Just my thoughts.

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post #3 of 7 (permalink) Old 09-16-2005, 04:44 AM
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yes, it loses its strength fairly quickly. the rise of KH is from the crushed coral slowly disolving, thus releasing calcium carbonate into the water. the initial erosion is much quicker than the later erosion.

as an alternative to CC (crushed coral), you may consider just adding Baking Soda after each water change. 1 teaspoon per 50g's increases KH by 1d (18ppm).

much quicker and much more reliable than crushed coral.

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post #4 of 7 (permalink) Old 09-16-2005, 04:48 AM Thread Starter
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Thanks shuks. Yes, I thought that as well and was sure to check on the day before water change.

Spar, the baking soda seems like a better, more consistent idea. By the way, when people mention teaspoons/tablespoons do they mean heaped or flat?

Thank you both once again.
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post #5 of 7 (permalink) Old 09-16-2005, 05:00 AM
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Quote:
Originally Posted by Cruise Control
Thanks shuks. Yes, I thought that as well and was sure to check on the day before water change.

Spar, the baking soda seems like a better, more consistent idea. By the way, when people mention teaspoons/tablespoons do they mean heaped or flat?

Thank you both once again.
i do flat. but really just scoop and toss the little difference between flat and heaped won't impact KH to too much of a degree.

just remember that when you do water changes, only add baking soda at the porportion of the new water being added.

i still keep a little bit of CC in my sump in my 180g to help replenish the KH loss that is natural in the nitrogen cycle. but at a KH of 3.5-4 (assuming that is where you are aiming), you shouldn't even need any CC anymore.

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post #6 of 7 (permalink) Old 09-16-2005, 12:41 PM
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Actually heaped vs flat can make a huge difference.

It's one of the reasons why cooks grab and toss and bakers weigh.

A heaping teaspoon or tablespoon can be as much as 1.75X as much as what you think it is.

Teaspoons and tablespoons are ALWAYS measured flat. In fact any measuring spoon is always measured flat, no matter what the units.

As is any measuring cup. No matter what the unit.
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post #7 of 7 (permalink) Old 09-19-2005, 04:13 AM Thread Starter
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Thanks guys. Appreciate the advice.
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