You should get fine sugar sand and stay away from crushed coral. I have samoan pink or something like that and it is great. Make sure you get aragonite sand instead of silica sand to aid in water buffering. Also look into oolitic sand, it is safer for your inverts and gobies, other sands might be too sharp and will damage fishs' delicate gills. Just my $0.02
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There comes a time in this hobby when it's just cheaper to silicone around the windows.
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