Stalactite decoration help

Hi guys,i need suggestions for my stalactite i'm out of species lol. Here's the parameters;



-its dim lit

-medium flow

-the front panel side has only 1/2 inch space

-Mushroom seems to do well.







I've run out of money and ideas those i've tried died. thats why its still bare.

















at the end i have this little guy growing









This is the amount of light their is







I have between 1/2 inch to 1 1/2 inch between the front panel glass









thanks for your time and suggestions.



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