The best replacement for fish only is reef tank.

The best alternatives to fish only are rated as following:
★★★★★  reef tank
★★★★  reef
★★  reef aquarium

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

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



Google Trends

Scale is based on the average worldwide traffic of fish only in all years. Click on graph for more.
fish only
reef tank
reef