Good idea about the BB on the DW, might be a small amount, but could help a little.
I posted a response from your photo / album pic comment re the Pom Pom crab.
These
FW Poms might be too small and become a snack for the Silver Dollars when they grow.
Also more
FW Pom crab info in the description.
https://aquaticarts.com/products/pom-pom-crab
Re: the
SW photo you commented on...
If you love the Pom Pom
SW crab like I do, then consider a little nano 10G
SW Macro algae Invert tank with Anemone / aka Sexy shrimp, Micro Brittle stars, and Rock Flower Anemones and a little Yellow Clown Goby

Was one of my most favorite fun tanks
SW nano with Rock Flowers and a Anemone Shrimp
https://www.aquariumadvice.com/forum...ture70671.html
https://www.aquariumadvice.com/forum...ture70670.html
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New to FW fish? First tank in a long time or EVER??? Need some info on keeping fish?

Start here - Aquarium Advice Article
https://www.aquariumadvice.com/guide...ater-aquarium/
FW Favorites right now Clown Loaches, any shrimp - SW Vase Red Mangroves