What are the dimensions of your 20l aquarium?
Filter re moderate or high flow?
Bettas are not well suited to high flow even when there are some lower flow areas, choosing a short fin Betta such as a half moon plakat HMPK is recommended - not a “Dumbo” as these fish are compromised by those huge pectoral fins and should be kept in low/no flow setups, also “Dragonscale” Bettas may have issues as they mature with the “dragonscales” covering gill plates and even their eyes (choose juvenile dragon Bettas with minimal head coverage, a reputable breeder will be selecting to limit/avoid this defect)
yh, however these guys do not accept flake foods at all.
(In reference to scarlet badis)
I’m not sure where this conviction (convention?) comes from ... a lfs almost always has
Dario dario or
Dario sp. ‘Myanmar’ in stock and both will eat and thrive on suitably sized Bug Bites (small pellet Tropical or Betta pellet (even smaller so no need to crush further))
When fish arrive they are started with decap brine shrimp eggs (reputable source is important) - and various other small foods as there are always other small fish in sale tanks
Despite most arriving fish being male, they seem to manage group living (with care)
Jurijs mit JS had several D ‘Myanmar’ males and obviously some females in his 60 x 50 scape - as he had juveniles appear - note he also feeds live foods including grindal worms