I would say "yes"
Oh. I don't have e crypt Blassi that I'm giving away - the OP asked fro a large plant suggestion so I made one.
I would rinse the sponge and filter media thoroughly every week during the water change. Cyano is due to organics, nothing else; water flow is often
^^^ For API at least*
Oh and not sure about nitrates I'm not home to test at the moment. The tank is understocked and planted though so I doubt they are too high.