Cabomba is a particularly delicate plant, that I myself have never been able
to keep from rotting, in any sized gravel at all... I would bet a soil
substrate could hold it down and not put too much pressure on the stalk to
start the rotting process, but alas, I'm sure you'll not be using soil, so I
would venture a guess to say that maybe trimming the lower 1/4 part of it's
leaves, cut stalk at an angle, dig a small recess in your gravel to allow
you to place it deep enough to hold, gently place gravel around it, but
realize if you damage the stalk, that's where the rotting will begin,
again....

Good luck, as I've never had any luck with ANY cabomba I've ever had... Now
Crypts on the other hand.. wow... need some? jk...
"Scott Taylor" wrote in message
u...
I have a large amount (approx 40 grouped in lots of 5 or 6) of Cabomba
cuttings in my 48" x 15" x 12" tropical freshwater aquarium which is
filtered by an UG filter and an 800lph Canister Filter. The tank also
recieves around 10-12 hours of light per day. My substrate is small gravel
and I regulary add plant fertilizer to the tank (generally after the
weekly
water change). My problem is that the Cabomba cuttings rot at the base
just
below the gravel and break off and float aorund the tank. The tank also
contains around 30 cuttings of Myriophyllum and 20 of Hygrophilia but they
don't rot like the Cabomba does. Every article I can find about Cabomba
says
that it is fine for gravel but none mention this problem I keep having.


Does anyone know what I am doing wrong and the best way to fix it? Its
just
getting annoying having to constantly replant those cuttings that keep
floating away!