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Old 02-15-2010, 05:28 AM   #21 (permalink)
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Default Re: Is crushed coral ok for substrate?

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Originally Posted by 90gal View Post
I think it's important to realize that this guy is a beginner for live plants; and now understands what is optimal versus what is acceptable. Not everyone wants to spend $150 on substrate. Maybe the guy doesn't want a heavily planted tank with red colors abounding, maybe he doesn't want to dump $2k into developing a 100 gallon planted tank, maybe the tank isn't going to be the main focal point of the house. Folks here need to realize that maybe not everyone have their planted tank as their top financial priorities; and for some folks, it's a HOBBY and not a life-changing event.

I think he gets it - increased $$ = increased proliferation (better filters, higher WPG, super substrate, Co2, etc...). Although at this point; guy wants simple advice. How about passing plant-specific recommendations on what is acceptable for what he has?
I certainly wasn't suggesting he spend hundreds of dollars, only that the crushed coral isn't ideal, even for many of the nicer beginner plants such as Ludwigia repens and Rotala rotundifolia, both of which are usually staples for beginners and often found easily in stores. My point is to help give him the greatest chance of success.

Any cheap inert gravel would suffice better than crushed coral in my humble opinion.
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Old 01-22-2016, 10:26 AM   #22 (permalink)
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Default Re: Is crushed coral ok for substrate?

I naively added several pounds of crushed coral to my sand substrate some years ago and I have to say that the plants don't like such a high pH. I have a hard time lowering the pH. The plants struggle in it. I should start trying to remove some of the CC.
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Old 01-24-2016, 05:39 PM   #23 (permalink)
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Default Re: Is crushed coral ok for substrate?

Every time you get the pH a bit lower more coral sand will dissolve. It dissolves best in low pH. As more dissolves, the pH rises.
If you do not like this chemistry, then redo the tank. Get rid of all the coral sand. You are not going to get anywhere trying to lower the pH while the coral sand is in the tank.
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