Thanks to both of you (Cristy and Matt). I think I'll stick to looking for a used tank. At least I now know what to look for regarding the silicon.

@biwaxman2 No. Will definitely keep that in mind going forward. It is probably the best independent store located close to me that has a pretty good tropical community selection. There are others around but they appear to be predominately salt water ... which is a little too advanced for me right now.

Thanks. I'm going to wait a couple weeks to see whether I can locate one used but, if I buy, I'll reach out to them. I know that there will be things I will have to buy new (just based on the specificity of what I'm looking for), so I'm trying to go used where it is feasible.

You both gave me a lot to think about. I was leaning toward the FX4 as it would allow me to reduce to one filter. As Matt stated, most websites recommend a 5x or 6x turnover of the water. And the FX4 could do it in one device. Plus, I wanted to minimize hardware in the tank. One filter, one set of input/output hoses. However, I was unaware of the propriety hoses. Not sure whether I want to be tied to that. It would be nice to be able to get standard tubing at Home Depot if disaster strikes. Plus, Linus's comments about the heater caused me to learn about in-line heaters (I did not realize that they were a thing) which do not work with the proprietary hoses. Plus, all the other in-line devices available (e.g. CO2 reactors) which the FX4 would prevent me from using. - Jason

Tried NOVA Tropicals in Dale City. They had some in stock. $345. Online sources cost $400 and another $200 for shipping. At least I know that they are an option.

Thanks. I’m going to keep looking. That is what I was told at Centerville Aquarium. They said they see it so infrequently that they could not even give me a ballpark price