Looks good man. Looks like a nightmare to clean tho. +1 on the shrimp. Cherry shrimp and snails would be reef-like
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I used to keep a big lava rock in a piranha tank however I remove it because lava Rock surface is rather abrasive so it might damage fish if for some reason they dart against and rub their bodies with lava rock surface...What is your experience about this and what is your opinion?.
I use lava rock in my african setup and haven't had any issues with it. All the caves and tunnels work great for breaking up aggression.