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===I lost a mosquito fish as well on the same spot, maybe jumped trying to
=== catch something in the air.
===
=== Anyone know how to "glue" river rocks together? Do you think I can use
=== aquarium silicone to attach some rocks to the rims of the barrel?
=== (plastic liner)
===
=== Those with the cascade barrels, do you tilt the upper barrels slightly?
=== I did and at some places the water is closer to the rim of the barrel,
=== so I think I need to build some kind of net or dam to fence off those
=== areas.

I owuld use great stuff expanding foam not silicone, and just be aware
not much really sticks to the material preforms are made from.

No need to til the barrels, water is going to spil out the lowest
elevation which in the case of a spillway type liner is the spillway
lip. Water is always going to be "level" so therefore you evidently
did not have your barrels setup level to begin with, or..........what
I have found is a problem that does not show up until after thr
barrels are full of water is the barrel liner itself does not lay flat
against the bottom of the barrel itself, and the weight of the water
pulls the barrel liner down into the barrel even more and may pull a
side down in one place more than another, or in general settle down
into the barrel and make the top edges on a slant.

Best thing to do is measure from your liners outside bottom up to the
bottom of the top inner edge of the rolled over edge which fits on the
barrels cut edge. Then measure the distance from the top of thre cut
barrel to its bottom. Subtract the difference between the two and
thats how much sand or fine gravel needs to be added to the inside of
the half barrel, to support the bottom of the liner. 20 gal of water
is over 150# and the liners lip is not designed to support that kind
of weight, so you need to support the barrel liners bottoms. Measure
it at a few places from the liner top to the water surface and it
should all be the same distance if the barrel/liner is setting level.
If not adjust accordingly. Properly supported and level they work
fine, and depending on the size pump used, will put out a decent fow
of water out of the spillway. My wifes triple barrel setup with a MAG5
creates a flow of water out of the two cascade liners of approximately
5/16 to 3/8" deep and the full width of the spillway, . You have to
level and support those liners in a barrel for best results, no dams
or nets needed, and water should be approx 3/4" to 1" or so from
liners uppermost edge.

I keep tropical fish in the wifes triple barrel setup, and used a
piece of lexan of 3/32" thickness cut into a strip 6" high that is
rolled into a circle the diameter of the lip on the liner, and it
serves as an almost invisible barrier to those that jump. Have yet to
loose a fish, and they are not obtursive to the view. Almost
invisible to the eye if kept clean.....I had used 1/2" plastic ridgid
net formed into a sort of fence / barrier previously,m and it did not
work all that well as rain would fill up barrels and fish could then
go through the mesh if they wanted........NOw there is enough space
for excess water to flow between plastic barrier and liner and not
allow fish to excape in the flow.

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"The original frugal ponder"
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