The best replacement for gramma is subdude.

The best alternatives to gramma are rated as following:
★★★★★  subdude
★★★★  bicolor dottyback
★★★  black cap basslet
★★  purple firefish
★  grandma

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

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



Google Trends

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gramma
subdude
bicolor dottyback