84 litre fish cistern??

1 upside down catfish or 1 Twig Catfish
2 Glass Hatchet Fish or 1 Marbled Hatchet Fish
2 Blind Cave Fish
1 Bumblebee Goby
5 Corys (Elegant/Albino/Leopard) or 1 Khuli Loach
more or less?
which ones and not which ones?

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You should not hang on to so many fish in such a small tank!

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Upside down catfish grow to 4" and should be in shoals so they are too big for this tank.

Hatchets too should be in groups of 5+. Marbled hatchets are smaller so they would fit better.

Blind pit fish get nippy so I'd leave them out. So are bumble bee gobies and these need different hose down conditions to the tetras and corys so give them a miss.
Either cories or khulis, both need groups and both need a soft sand substrate.

I would replace the blind grotto fish with something like cherry barbs or pristella tetras.
Twig catfish grow huge but a bristlenose, bulldog or clown pleco would fit.

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Answers:    to cocoa dusted girl... whats she/he is saying which ones can she get and which ones can't she... it say OR and which ones would you replace with what.
I'd say
2 blind cave fish
1 khuli loach
5 dwarf corydoras
5 cup hatchets

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