You can use mollies to cycle your tank. They survive fine in sal****er.
As for the UGF...IMO they're alright if you're doing a FO or FOWLR tank, and
depending on the size of substrate you're going to use too. I have sand in
my tank so I couldn't use the UGF. For the Fluval canister, I'm having no
trouble with mine. I did however remove all the sponge and carbon from it,
added some Chemi-pure and it's basically just a powerhead now. If need be
I'll re-add the sponge to absorb some of the floating particles, but I take
it back out because it becomes a nitrate holding factory -- bad news in
marine.

Since live rock costs so bloody much, add a little at a time, as long as
it's cured! It must be cured before you put it in. I guess uncured is okay
as long as you have the patience to let it cure, but you can't have fish in
the tank at the same time...they'll all die.


"Ed" wrote in message
om...
Ok i am just getting started , i have a 75 gallon tank , i was told
that i need to purchase at least that amount of live rock according to
a chain pet store in our community . I was kinda put off by this , so
got the opinion from another store , and not a chain store . To which
they replied with a lil chuckle , and said no not really , but i do
need live in my aquarium . I was also told that i could start off with
molly's . Now unfortunately its too late for me to change over .
What i am asking since i seem to be getting conflicting advise is
to see if anyone with actual experience with this . Could tell me and
give me more advice on this subject . I also have conflicting advice
about using a under-gravel filter along with my fluval canister filter
that i am using now . One person said yeah its the way to go another
said its a ticking time bomb and would end up being more of a problem
then anything .


Thanx in advance
Ed