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the tank has no fish at the moment though.CAn you post the brand, type you used. Depends on the grades of the substrate

I like you tank. Looks cool.
I had thought when you said (edit - coral) it was crushed not the bigger pieces if that is what you mean
Gobies usually go for .5 to 1.5 mm sand if I am correct. The spec I read on yours is 1.0 to 2.5. I would think you’ll be ok. I may suggest reducing the amount of shells tho. Even though they are small detris can build up in them.
Good point by azzubr. Sand does blow around a bit so be mindful if you are adjusting your flow.
I bought a set of aquarium supplies from amazon ( fish net, scrapers, sand rake etc...) I believe the rake could be used pretty easy...

That doesn’t look too course. How deep is it? My goby likes a lot of sand.
No. Mine actually likes to move around shells. He piles all of them at the entrance of his caves.It's 1inch deep. It has a lot of sea shells though. You think the gobies would mind?
I added a few and he does move them around too, lol, we took vacation and we brought back some nice small shells back and I put them in the tank, sure enough, the goby moved them...No. Mine actually likes to move around shells. He piles all of them at the entrance of his caves.
I forgot it’s his house, not “my tank”.I added a few and he does move them around too, lol, we took vacation and we brought back some nice small shells back and I put them in the tank, sure enough, the goby moved them...

