The best replacement for reef tank is fish only tank.

The best alternatives to reef tank are rated as following:
★★★★★  fish only tank
★★  saltwater tank
★★  marine tank
★  planted tank
★  fish only
  fowlr
  fowler tank

Your alternative for reef tank is not listed? Suggest!
Speaking about reef tank, one probably shouldn't forget about canister filter.

Other search terms related to reef tank and their ratings are:
★★★★★ canister filter
★★★ hang on back filters
★ bio balls
You have in mind a companion for reef tank and it is not yet here? Propose!



Google Trends

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reef tank
fish only tank
saltwater tank