If LKR is a Sri lankan rupee, then I assume you are in Sri Lanka.
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Ageneiosus inermis
Ageneiosus polystictus
***These are rather rare and almost never kept, never reported on, so whatever you wanna know about these, you can pick up from internet. I've no experience with these.
Aguarunichthys tocantinsensis
Aguarunichthys torosus
***Bolt sounds like a good possibility for you. As for its cousin, I've never heard of anyone keeping it.
Bagarius suchus
***I don't know much on goonches. This one stays smaller, under 2', IDK of its interactions with tank mates.
Bagroides melapterus
***Could be too small-growing and too fragile to handle jardini.
Brachyplatystoma tigrinum
***Good possibility along with the juruense. 300 gal might be too small if for life.
Megalodoras uranoscopus
***Good candidate.
Platystomatichthys sturio
***A gamble. These seem hard to keep long term. Almost no such reports exist it seems.
Trachycorystes trachycorystes
***Good but reclusive and may prey on smaller tank mates.
Lophiosilurus alexandri
***Grows too big (3') and will eat most tank mates.
Pterodoras granulosus
***similar to irwini / uranoscopus, should work but they can grow bigger and faster
Belodontichthys truncatus
***No experience. The genus is kept in Asia. Toothy thing. IDK almost anything about it.
Brachyplatystoma juruense
***See above.
Leiarius pictus
***Too big. You wanna stay with catfish roughly under 1.5' and not too active a swimmer.
Pseudoplatystoma metaense
***Too big, swims too much.
Sorubim lima
***Good candidate except fragile when small, and also timid and skittish.
Ompok bimaculatus
***Good candidate but we seem to only get siluroides in the trade. Being in Sri Lanka, you migt find the bimaculatus.
Ompok argestes (yes ik its kinda small and only found in Sri Lanka)
***Small fish might be preyed upon by jardini.
Cephalosilurus fowleri
***Good choice but will eat everyone in your tank. You won't find fowleri but only apurensis.
Calophysus macropterus
***Ok choice. May or may not grow too big. Needs decent space to swim.
Cephalosilurus nigricaudus
**Same as fowleri.