What Can I Add To My Tank

[winralove]

ive had my tank running for about a year now it is about 250 litres, im looking for ideas t add fish i have

1: silver shark 12cm
1: Blue Acara 6cm
1: Bristlenose 8cm
1: Albino Shark 8cm
1: Ghost knife 7cm


any sugestions please

 

[Luketendo]

I know Silver Sharks like to be in groups.