Thanks Sid, this is really helpful! I think the filter cartridge he showed me was a 2 - in - 1, with carbon in the middle and your "mechanical filter" on the outside. I don't know much about filter media. The tank I have now is just a biological filter. If not Carbon, then what do you suggest?
Also, they told me its better to not use treated tap - water anymore. I always suspected this, but can you confirm?
PS From my reading I gather it is not really a great idea to cycle a planted tank before adding fish in, because the plants need the fish waste for food. Is this correct? Do you think it would be safe to set it up and add my current fish family over to it immediately? Or wait a period of time? I figure I should atleast wait, no matter what, to add the NEW fish in.
What kind of filter did they recommend? I'm not current on newer ones.
But you want all the biological media/filtration you can get. It is GOOD! It's usually sponges in power filters, or other media with loads of surface area.
I've always cycled with a few hardy fish and as many plants as I could fit in the tank/the plants I wanted in my aquascape. And tried to use at least some fast-growing plants.
If you already have filter media from your current tank (you should) you can add that to your new filter...hopefully...and that will kickstart your cycle in a big way. I had done that for yrs...started with filter media from another tank, popped a few fish in right away, plants....and no major danger spikes at all.
Cant you just move your old filter over to the new tank? If you dont want to use the old filter in the new tank (is it not enought gal per hr for that tank?), I would put the old filter on the new tank, add all the old fish, and also put the new filter on it. That will seed the new filter and support the fish with the old filter. Use a good bit of water from the old tank and I dont think you'll even have to cycle the tank.
And dont panic when you get a coating of brown algae...it's fine and a couple of ottos will clean that up in a day or 2.