Cyanobacteria Bloom in DSM Tank
I'm new to the forum and signed up just so I could specifically ask this question. (I searched but didn't find anything that was close to my scenario so I'm reaching out for help.)
So about six months ago, my 4 y/o niece ended dumping a whole canister of fish food while I was away and ended up nuking my tank. I came home to what looked like a nuclear wasteland. The whole tank was completely green and covered with cyanobacteria slime. I did my best to manually remove it but to no avail, I tried H2O2 and that didn't seem to do much (Maybe should have used more but its too late now)...
I ended up scrapping everything and restarting completely. I bleached the rocks for a week and completely threw out everything except for some of the substrate. This was my mistake. Its a 29 gallon and I felt bad about throwing away $100+ of Fluval shrimp and plant stratum. So I ended up buying more substrate and rescaped the tank with new ADA Amazonia and planted a bunch of dwarf hair grass and planned on dry starting the tank. After three weeks I noticed a return of cyanobacteria on the surface of my substrate next to the location of my hair grass. I panicked and began to spot treat with H2O2 but ended up severely damaging my hair grass and practically killing some stems while only harming the cyano on the surface.
Unfortunately, I need more time for the hair grass to carpet so I don't want to flood the tank yet. So I cant just use erythromycin, or manual removal, or H2O2.
I know I made a lot of mistakes but I'm asking if anyone knows anything, or has dealt with this before, or can provide advice or something that I can use to save my tank. I really love it and as a college student, I don't have enough money to completely restart from scratch again.
Any help would be HIGHLY appreciated.
Sincerely Mark S.