Hmm this is interesting and perhaps we've been lucky. We have not had any pests to contend with and have only used coco for our indoor grows.
We found a good supplier for the roots organic line and ended up just pulling the trigger on it. These 'premixed' bags are a little more pricey then doing it yourself. But for the price we pay per 1.5 cuft it just saved us a lot of time and extra work. Not to mention less messy and helps prevent brining bugs into the grow area. We don't have the space to mix inside. Can't risk the mess that could happen.
Coco coir from our research is also naturally resistant to pests, as there isn't a lot of decaying matter for them to feed off of. However if your pest are enjoying the plants then this is a different matter completely. But for the former, that's what led us to use it and really enjoy it. We didn't have the expertise to run a multi-plant rDWC.
Not yet at least :cool:
We feed once every couple of days, using GH Maxi grow/bloom, and
calmag and armorSi. Mainly just the first 3.