Bolbitis And Why Is It So Susceptible To Brown Cyano Algae?

I have it doing very well low tech...but its the only plant in the 240 gallon that has a brown algae that you cant even scrape off..it tunnels into the plants cell walls. I have tried Maracyn and yes,it worked very well...the brown dying off totally and the fern responded with fast new lush growth. Weeks later and a few water changes and the cyano is back. This is one Goldilocks plant needing much help from water changes and iron added.
I must have accidentally reintroduced cyano after having it die off after Maracyn a couple of months ago.

 

By the way,I found that Maracyn not only kills off blue green and brown algae..it does kill black brush algae also. Keep making big water changes to hold it off for good.

 

Erythromycin will kill the brown cyano on Bolbitis. You notice you cant even scrape it off with a fingernail? Its like it gets into the plants cell walls. Antibiotics absorbed by the plant works. In low tech tanks...water changes and doing your best to get a flow of water over it as Bolbitis has a great ability to collect detritus..uncanny. A good flow keeps the leaves clean.
Don't let others guilt trip you on using the medication to cure valuable sick plants. Fish stores everyday sell it to customers to use on $5 fish...using it to save a $100 or more clump of Bolbitis heudelotii is not medication abuse. Tell them I said so.

 

Soon. Next water change I should prune off a few leaves with it. Its growing fast...so is the brown. No other plant in the aquarium has this problem. None.