re: the pond filter question above, I see the ridiculousness of prices in the realm of anything labeled "FOR A POND" has not abated in the 10 yrs since I built mine. 
Your problem is the depth: 8 in is simply way too shallow for almost any of the items on that page you linked to. I have the Tetra model shown in the very bottom left and IT'S too tall--around 12 in, I'm guessing looking at it out the window where it sits in the not-currently-in-use-but-not-broken-so-can't-throw-away pile--for your setup.
What I use now is this. The "filter" aspect if it is the little sponge over the intake; if your pond is very gunky you pop the cover off, rinse the sponge, pop it back in, the cover on, and you're set for another 1-2 weeks. Attach some flex pipe 3/4 in over the top outlet and run it out as you desire, so that th water spashes back into the pond. Aeration is provided, pleasant splashing sounds likewise, and the water is kept circulating to whatever degree your length of pipe allows.
The filter is only about 5 in. high but with the output hose it would probably stick out above the waterline in an unattractive manner. Solution: lay the pump over on its side. It doesn't care. If you have some rocks lying around you can make a nice little waterfall, set the pipe end back enough it can't be seen and the water appears to be flowing out of the rocks. Or you can just put the rock on the end of the pipe sitting on the edge of the pond wall to keep it from being knocked over by animals or flipping around from water pressure.
I got the 2300 size because the 1800 was on backorder everywhere I looked. But the price isn't that much difference and I am quite happy with the results on this one. Recommended heartily.
Your problem is the depth: 8 in is simply way too shallow for almost any of the items on that page you linked to. I have the Tetra model shown in the very bottom left and IT'S too tall--around 12 in, I'm guessing looking at it out the window where it sits in the not-currently-in-use-but-not-broken-so-can't-throw-away pile--for your setup.
What I use now is this. The "filter" aspect if it is the little sponge over the intake; if your pond is very gunky you pop the cover off, rinse the sponge, pop it back in, the cover on, and you're set for another 1-2 weeks. Attach some flex pipe 3/4 in over the top outlet and run it out as you desire, so that th water spashes back into the pond. Aeration is provided, pleasant splashing sounds likewise, and the water is kept circulating to whatever degree your length of pipe allows.
The filter is only about 5 in. high but with the output hose it would probably stick out above the waterline in an unattractive manner. Solution: lay the pump over on its side. It doesn't care.
If you have some rocks lying around you can make a nice little waterfall, set the pipe end back enough it can't be seen and the water appears to be flowing out of the rocks. Or you can just put the rock on the end of the pipe sitting on the edge of the pond wall to keep it from being knocked over by animals or flipping around from water pressure. I got the 2300 size because the 1800 was on backorder everywhere I looked. But the price isn't that much difference and I am quite happy with the results on this one. Recommended heartily.
