The best replacement for live rock is coral.

The best alternatives to live rock are rated as following:
★★★★★  coral
★★★★★  live sand
★★★★  dry rock
★★★★  dead rock
★★★★  bio balls
★★  reef
★★  base rock
★  deep sand bed
★  bioballs
★  refugium
★  real reef
★  uncured
  fiji live rock
  protein skimmer
  no live rock
  dry live rock
  live rock
  lace rock
  cured live rock
  ocean rock

Your alternative for live rock is not listed? Suggest!
Speaking about live rock, one probably shouldn't forget about coral.

Other search terms related to live rock and their ratings are:
★★★★★ coral
★★★ algae
★★ fish only
★ protein skimmer
bio balls
fish already in tank
coppersafe
corals
dry rock
canister filter
You have in mind a companion for live rock and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of live rock in all years. Click on graph for more.
live rock
coral
live sand