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footlong carp

it that a brick?

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Can't see the problem with lime being leached, lime is calcium hydroxide (well for fish such as africans it's good)

used to increase hydroxide ions in the water which increases kH and pH

also marine people use it as "Kalkwasser" dosing

I use bricks made from limestone in my tanks

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aerated concrete also known as hebble is also full of aluminium hydroxide, and is a big no no..

clay bricks should be fine, old besser bricks will leach much less lime, new ones could potentially leach too much, aqnd even with regular big water changes could resulyt in unstable and fluctuating ph..

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anyone know if you can put a besser block

done it before with no problems

but if they are new, soak it for a few weeks first

can always test the soak water for a pH high range spike.

just looks ugly is all

but ya used a lot of concrete based rocks in tanks before with no problems.

Heck I have seen concrete ponds for breeding discus in malaysia lol

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