nice job on strapping the diffuser to the top of the BD. I would spray paint that white fitting with krylon plastic paint or head over to the ABS section and get a black one. That white piece in the water will make you crazy, trust me. I confess I love your saddle support pieces. What did you use to cut 'em out exactly? A grinder? Nicely done.
So, basically you are saying that you are not going to lay your grid on that low lip of the stock tank and you're going to go lower. Honestly, there's nothing wrong with that idea at all. I wouldn't go lower than 5", however, as you really want to allow for space so that vortex motion of the water. If you squeeze that space too small, you might inhibit that from happening. Plus, you want to give a big enough space to collect your detrius too, otherwise you may find it forcing itself up into your media and you needing to do more flushing. I think 4" is too short, but you'll likely be fine with 5-6".
Think of both those spaces as being equally important. Yes, having as much media in there is important, but that open lower space is just as important as that's the spot you need to flush. You want the functionality of that space to really work well and not be cramped so as to inhibit proper action.
:fish: please any advice would be appreciated.
