55 Gallon Aquascaping

  • We are currently upgrading MFK. thanks! -neo
Standard PFS will work fine, but your post sort of sounds like you want to brainstorm. Some people swear by black sand too. There are really many reasonable substrates and depending on your fish, your tank equipment and you, some may be better than others. I'd look for some choices and not settle too soon. You can always go with some grade / color of PFS.
 
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