I am someone that has just gotten interested in aquaponics. I'd like to know how to go a cheap & easy DIY route. I do raise redworms and BSFL. What type of fish will eat this type of food. I've seen a video where someone uses sink spray hose guides for bulk head fittings. Is that good or bad? What is the best substrate for the growbed? Is it practicle to use a solar battery setup to run the water pump? And is a biofilter needed in a small system? Sorry for so many questions.