The best replacement for coral is king snake.

The best alternatives to coral are rated as following:
★★★★★  king snake
★★  salmon
★★  peach
★★  milk snake
★  sand
★  cortez
★  live sand
★  salmon color
★  corral
★  salmon colors
★  hydra
★  sponge
★  fish first
  bamboo coral
  hard coral
  anemone
  william hill
  ladbrokes
  aragonite
  coral reef
  fairwood
  peach color
  sponges
  tina
  soft coral
  naples
  dendro
  king snakes
  reef

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

Other search terms related to coral and their ratings are:
★★★★★ zooxanthellae
★★★★★ seahorses
★★ live rock
You have in mind a companion for coral and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of coral in all years. Click on graph for more.
coral
king snake
salmon