I'm running heaters right now, reservoir temperature is 19 celcius water goes to >15 if i turn them off.
roll them cooler. if i had 15 ambient when i ran active rdwc i'd've been ecstatic.. my room temp brought it up though as we ran hps back then exclusive.
we targeted about 17 in the res so it's not like you're extreme or anything. i like it lower than 20. i like it between 15 - 17. cooler water carries more oxygen. but your room temp has to be in the 18 - 22 range. the water temp rises in the buckets before returning.
a constant 20 - 22 at the res is where we saw stuff really starting to hate us. running a cleaner or h202 constant will help clean that up a bit but it gets nervous.
what's your room temp ?
My local cheap H2O2 is actually 3%, holding one right now.
that'll work. maybe run two bottles. and add a ltr of water.
you'll have to drain everything out and use it on it's own. i used to use it with cal-mag alone and ph it or just nothing and ph for good measure.
you can let it run up to 12hrs. clean out the res / buckets and re-feed immediately after. i used to let it run all night actually. i never worried about more than 12hrs
you can run run it as a constant at about half that strength to keep ahead of things. it shouldn't interfere with a live res at that strength, but be watchful, as it works mostly better in sterile. you can run it sterile at that strength no worries.