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Sometimes, it's enough to just have a general rough draft of it on paper..
My method is to buy a ton of dry-rock and smash them into pieces and picking out the pieces that would be unique or fit well with the model.
if you would like a cheaper alternative, there’s an app you can pay $5 for that can give you decent readings.
it’s an app called Photone and has had great reviews on r2r
I’ve used it too recently on my new build and I’m quite content with it
my nano 10g was infested w bubble algae
threw one emerald crab in there, didnt touch it.
threw a second one in there, they both started eating at it
they ate it all, but its starting to grow back in some of the harder to reach places