Seaweed extract sprays might help
aerated compost tea sprays
aerated worm tea sprays
even aerated corn meal tea spray (this was a kinda home brew idea I saw mentioned for tomatoes somewhere)
These may all help in the context of improving plant health and bio-diversity helping to combat disease organisms by out competing them.
With all sprays, make sure to dilute enough and spray when appropriate (this gets tricky in hot humid climates since you don't want to spray before or during the heat of the day since that can cause burning but you might also not want to spray at dusk since that leaves the plants wet overnight which can sometimes cause problems as well, might mean spraying at dawn but test to see how the plants do with it.)
I've also heard of some home brew type methods that might use baking soda, hydrogen peroxide, vinegar, milk, corn meal, garlic, or hot peppers. If used quite carefully, these might have some used as sprays around aquaponics. Be sure not to overdose with any of them of course. (Be ware of oils or soaps around AP since they can suffocate your fish.)
I've even heard of using milk as a spray to combat some things, didn't work on my powdery mildew though, perhaps I'll try it on the downey mildew I though I saw. Now milk may not be the best ingredient to actually battle a disease but I did find that it seems to be a good choice as a spreader/sticker since you need to avoid soap and dish soap in sprays used around Aquaponics. Most home brew plant sprays use some dish soap so perhaps substitute some dried milk instead to make it fish safe.
It might also be worth finding out if there are any specific deficiencies in the soils around the volcano where you got your media. Volcanic rock might be pretty good but if the farmers around there have to add something special to grow stuff well, you might need to look into ways to supplement that trace element. Many diseases can be linked to deficiencies.
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