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Discussion Starter · #1 ·
I have a 4x2x2 with 180L sump that I want to use as a mbuna tank. I assume I can fill the sump with suitable media and use it instead of an external filter?

In Sheffield our water is very soft with a ph of 7.6, what do I need to do to make it suitable for mbuna? Finally are mbuna a good choice for a first cichlid tank?
 

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No need, for KH use baking soda. For GH use Epsom salts. But pH of 7.6 is fine so if it is stable I would not do additives.
 

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I've been keeping tropical and then marine fish for a few years and the pH has never really changed from 7.6, if it does it's by an amount that can be seen as test error (never been above 7.7 or below 7.4 in what must be 150 tests)
 

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The pH has to be low for calcium to dissolve into water. By the time the limestone or crushed coral contributes calcium, the pH would already be affecting the fish. Established rock has a biofilm that makes even that ineffective by sealing off the rock surface. If you like the look, it will do no harm.
 
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