Filter media can definitely have minor die off when even swapping over tanks quickly.
I would do at least 20% wc twice a week and feed every other day to see if it clears up. I always get algae flare ups in the early stages of tanks. But normally it’s becasue my no3 is high. 5ppm is super low. So you must be doing big wc already. I can’t keep my tanks that low unless I skip time on my test instructions haha, or do like 50% changes ever 2-3 days
I would do at least 20% wc twice a week and feed every other day to see if it clears up. I always get algae flare ups in the early stages of tanks. But normally it’s becasue my no3 is high. 5ppm is super low. So you must be doing big wc already. I can’t keep my tanks that low unless I skip time on my test instructions haha, or do like 50% changes ever 2-3 days