My fish keep dieing

My tank is 150lt
Tank mates
6 Cory dora
10 Cardinal tetra
11 Guppys
2 Swordtail
4 danio
2 platy's
2 algae eaters
Tank has been running for about 6 months.
Everything was fine until I got the sword tails,

PH 7.4
Ammonia 0.ppm
Nitrite 0.ppm
Nitrate 0.ppm

Canister filter
Upgraded filter media with biohome ultimate, ( no carbon)
Your tank was 250 liters in the first post now it is 150 liters?
 

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