Tank is 65 gallons. I want to have tunnels and gaps for fish to swim through and hide, but also want to make sure they have plenty of room to swim. Should I take a couple pieces out and put them in refugium or keep it like it is?
Also, will algae start covering this up? My Gyre creates awesome flow and moved my sand around a bit

Also, will algae start covering this up? My Gyre creates awesome flow and moved my sand around a bit





