Every time I have cultured phyto, I usually get a few weeks before it beings to look flakey which I assume is from contamination. I don't split the culture because it never becomes dense enough to need to split. Every thing that touches the (distilled) water (and salt) gets put in scorching water and/or rubbing alcohol for several minutes. I think that the possible contamination comes from red sea coral pro salt which may contain bacteria (https://reefs.com/magazine/bacteria...ing-and-granular-activated-carbon-filtration/). Has anyone else done a phyto culture with red sea salts? The only other thing that I do differently with this culture is have the light on 24 hours which I have heard of others doing without issue. I am just wondering if I should bother getting more fertilizer (I am out atm) or just get some dense pre-bottled phyto and stop trying to culture it.