Addressing Some Issues With My Oldest Nano Aquascape + Big Maintenance Session! Keep or Rescape?

The other day I noticed a few issues with my 20 liter nano aquascape. Time to fix that and do a big maintenance session. Or should we take it down and make something new?

Aquarium Details:

20 liter cube from Dennerle 25x25x30 cm (20 liters)
https://amzn.to/3ofmNbi
Chihiros C2
https://amzn.to/3klmBoU (EU)
https://amzn.to/3o5cLcS (US)
Tropica aquasoil
https://amzn.to/37tOyr0

*AQUARIUM*
20 liter cube from Dennerle 25x25x30 cm
EU https://amzn.to/3ofmNbi
US https://amzn.to/38FA0EV

AQUARIUM FILTRATION
Internal filter
EU https://amzn.to/3DqGfJm
US https://amzn.to/3nl8HXs

AQUARIUM LIGHTING
Chihiros C2
(EU) https://amzn.to/2K5VcKy
(US) https://amzn.to/3o5cLcS

AQUARIUM FERTILIZERS
Liquid fertilizer
EU http://bit.ly/2LFmDvl
US https://amzn.to/3bwAfnp
Bottom fertilizer
EU http://bit.ly/2LFsxfO
US https://amzn.to/35xnFR2

AQUARIUM HARDSCAPE
Spiderwood
EU https://amzn.to/3i8jgcu
US https://amzn.to/3seERo5
Lavarock
EU https://amzn.to/3nDJB37
US https://amzn.to/3bwz9bh

OTHER ACCESSORIES
DIY CO2 https://youtu.be/OtpfltN15-8

SUBSTRATE
Tropica aquasoil
EU https://amzn.to/37tOyr0
US https://amzn.to/3qbwlEv

AQUATIC PLANTS
Hemianthus callitrichoides 'Cuba' , fissidens fontanus, bucephalandra, mini christmas moss, rotala H'ra, cryptocoryne nevellii, anubias nana mini mini, Riccardia chamedryfolia

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