I would seriously complain. That's just not right at all! *getting mad* She probably just didn't want to bother with getting the betta out of the little tank or something.
If you rinse the river pebbles well, I don't see why they can't be used. To be honest, they're almost the same as the expensive "aquarium" gravel anyway.
That is soooooo rude! You should complain to the manager because that's not right. Customer service means helping everyone, not just adults! And anyway, in my book, 15 (soon to be 16) year olds are pretty much adults. Seriously, that's so rude. I give you credit for not yelling at her.
Got the plants! :) Thank you I liked them a lot... are the smallest things the duckweed? I didn't realize how tiny it is... I put it in a one gallon tank to QT and put them out in the sun... without Dechlore... are they going to be okay like that?
Since hte tank will be rearranged, it's a perfect time to pick up another girl.
Crypts are good but it can take them a while to settle in. Just be prepared for them to "melt." If you give them ferts, they should come back within a few weeks but they'll look like they're dead during that adjustment period. Nice, low-light plants, perfect for the corners of the tank where light has a hard time reaching.
I just did a major clean on my algae-ridden sorority this afternoon and I stuffed my girls into a 6 gallon Rubbermaid container. As a bonus, you can just float the plants in there with them and they'll have a place to hide. If you don't take more than like 4 hours, you don't even need to plug the filter in. One thing you can do is just take the filter media out and set it in the tub with them. As long as it stays wet.
How big are the rocks they have at Home Depot? You probably want small rocks, the kind they call "pea gravel." With bigger rocks, any uneaten food slips down between them and sometimes the fish get stuck trying to get to it.
The Fluval is loud? That's good to know. I've pretty much come to the conclusion that there is no quiet filter. *buys three more packs of ear plugs*
Probably the easiest way to make a substrate switch is to move the girls to a temp tank, drain everything, remove the plants, and scrape as much of the sand out as you can. It'll be okay if you have to leave some in but get as much out as possible. Stir the dirt a little and then add the gravel on top. Actually, you might want to plant the plants and then spread the gravel around them, 'cause it can get hard to jam plant stems through a thick layer of gravel.
Your tank will probably be a big cloudy mess though, unfortunately. Best way to clear that up is with extra mechanical filtration (more foam/filter wool in the filter) and lots of water changes.
Yup, you can definitely add an old carbon bag. Carbon is actually a great medium for cultivating bacteria because it's so porous; lots of surface area for the bacteria to grow. As for filters, I'd say go with whichever filter you can easily find replacement media for. I haven't had any experience with either filter but for me, Fluval replacement parts are always easier to find.