chemical cleaning

I’m so close to being ready to put dwarf seahorses in my macroalgae tank… the dinos are gone, the nutrients are stable, the macros are grown out, and the tank is pest free… except for the cyanobacteria. I know that chemiclean would get rid of it, but I’m worried that there may be repercussions...

Picked this up on sale. I have some of what I think is cyano or red slime, hoping to get rid of it. Anyone familiar with this product? Any tips?

So I snagged a used 200 to 250 gallon storage drum for free. The person getting rid of it had bought the house and the old owner had left it there. The only thing he knew was that the owner owned a detergent making company and probably used it to store chemicals in it. Is there ANY way to...