erm...
does Molly eat shrimps or small fishes?
I'm having a 2.5feet tank too. Running with a 1.5L bottle of DIY CO2 and 2 36w PLL light with reflector, and a HOB filter.

It's a shrimp tank, consider half tank planted.

The bad thing is, fine green hairy algea growing within the bunch of moss and spearding to other plants too.

But fortunately all plants growing well.

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Best Regards!
John Goh
016-3022567