To answer your original question, YES to rabbit manure. Mix it in with the mix in your SIP. My assumption is that you already have a good mix for an SIP, so I won't speak to that. You can either mix in at a rate of up to 1/2 cup per gallon, or you can mix about 4 cups into the fertilizer strip. It does not need to be composted. There will, undoubtedly, be some naysayers, but I've been using rabbit manure like this in both traditional containers, and SIP, and it works very well. It costs me about $30 a month to keep 2 rabbits, so you might even consider soemthing like that, if you want a renewable source, without having to transport the end product. I build my rabbit cages around a flood and drain table that they were throwing out at the local hydroponics store.
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