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Agridion said:
Background: Currently I am building 185 gallon tank with 40 gallon breeder sump, it will include two Koralia Magnum 6's (Positioned on the back sides hidden from view in my backdrop).

Question: I am thinking of building a custom reverse under-gravel filter/jets. it would be powered by a high gph submersible pump (~900 gph) with a sponge filter on the inlet (to prevent debris from getting pushed into the piping). I will not be building jets that come to the surface of the gravel (I am using a mixture between Cichild gravel and plant substrate, salt and peppered color) but instead running 3/4" and 1/2" PVC piping grid throughout the bottom of the tank with 13/64" holes (possibly a little larger) drilled through out the matrix. The holes will be facing towards the bottom of the tank so that the water flow will go though most of the gravel. The matrix would insure that there would be uniform distribution (or close to it) throughout the gravel. My thought behind this is three fold. One it would create more biological media (utilizing the gravel as a bacterial bed as well as the sump) and second it would decrease the amount of waste that ends up in the gravel (NOT eliminate, I know I would still have to vacuum the gravel). The third use for this pump with the sponge filter is that it would essentially pull water throughout my cave system (built into the background) removing waste from several of the caves and collecting it on the sponge filter.

What are all of your thoughts? What kind of pump would you recommend for this?
I was thinking of doing something similar to this, except I was going to drill the holes facing up so the water pushes up through the gravel. Starting to wonder if pointing them down might be a better option, but at the same time I wonder if there would be enough displacement of the water to actually keep the "poop" off the bottom if pointing them down.

Also thought about getting one of the pre-made under gravel filters and just reversing the flow... I've never seen what one looks like up close so I'm not sure if it would have the same coverage or if it would be able to handle the pressure water pushing through the system rather than being pulled.
 
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