<FW to BR>; cycling 7/22/16
I wrote a few months back re: switching my freshwater tank to brackish due to an
unexpected arrival, a green spotted puffer.
<Nice fish. Very intelligent.>
I intend to make the tank full saltwater, I even have a few Mollies in with him
(4 or so in a 30 gallon).
<Mollies are hit-and-miss with GSPs; do keep the Puffer well fed with a good
variety crunchy, filling foods (such as unshelled shrimp, used sparingly because
of their Thiaminase content, and more frequently things like snails and whole
lancefish). Hungry GSPs are more "bitey" than well-fed ones.>
Intend to move them to a 56 gallon.
My question is this: at what point can I stop worrying about ruining my cycle.
I did crash it the first time I added salt, then decided to go more slowly.
At what point (I'm at 1.008 sg) are the saltwater bacteria the dominant (or
only) beneficial bacteria vs. freshwater bacteria?
<It's very difficult to pin down, but around 1.005 at 25 C I'd leave the tank to
settle for a few months. Absolutely no reason to move GSPs above that salinity
unless you want/need to. Once at SG 1.005, there'll be a balance of salt-adapted
and freshwater-adapted bacteria, and you can make gradual changes upwards from
that without major issues. Alternatively, as/when the GSPs are ready for full
marine conditions, empty and break-down the tank, refill with full seawater, and
rebuild using ample live rock, and live rock should "instantly" cycle a full
marine aquarium without problems.
Make sense? Cheers, Neale.>