Who Gives A Fish Forums

Hey guys,

Considering a tank revamp after getting some new additions. Currently running crushed coral sand and 5 decent-sized ocean rocks in my 200L. Got Malawi Cichlids, syno petricola catfish, and a common pleco baby (don't worry, upgrading the tank before he gets too big).

Fancy trying a new aquascaping approach using rocks like slate, and ditching the ocean rock. Got a few questions:

Removing the ocean rock will change the pH - will this have a massive impact on the fish?
What's the best rock to use for this?
Can I add wood to the mix?
Should I remove the fish while making the changes?
Will it cause them too much stress?

Cheers guys

Removing the oceon rock will indeed change the pH, and its impact on your fish depends on the speed and extent of this change. It could have minimal effects or, in the worst-case scenario, prove fatal for your fish. To better understand the potential risks, I'd like to know the pH and hardness of your tap water.

As for the best rock to use, if you don't have pH buffering sand, I'd suggest limestone as a suitable replacement to help maintain a stable pH, especially since you're getting rid of the ocean rock.

Regarding the addition of wood, it's worth noting that wood tends to lower pH levels, which might not be ideal for your Malawi Cichlids, as they thrive in higher pH environments. If you still want to incorporate wood, I'd recommend using it sparingly.

Removing the fish during the change is probably the best course of action. The alteration will disrupt their established territory and potentially alter the water chemistry they're accustomed to, causing them discomfort and stress.