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Hmmm... maybe you've found the reason they are generally described with the "Care Level: Expert Only" notation. Is your caveat for general reef fish foods, or for the herbivorous food they require?
Suggest you respectfully ask the salesperson to feed the fish so you can see it eat. If they tell you "Sorry, it has just been fed!", go out and find yourself a more reliable retailer.
Sorry, I was being facetious (holy cr@p! I spelled that word correctly the first time!) about the 300G tank. I actually have no idea what size tank the poster intended to put these fish in. I think putting both in anything less than a 180 is just an accident waiting to happen...
They should both be OK in a 300 Gallon tank. That said, Achilles are notoriously difficult to keep alive, and Powder Blues are Ich Magnets, especially when they are stressed.
When one makes a hole in one's outside wall for a pipe that will feed outside air into a skimmer, what do you use to prevent bugs and other critters from entering that pipe? Won't some sort of filter obstruct the flow of air?
I have trouble buying the argument that silicone fails in a well built tank. I have a 90 and a 65 (both O'Dells) that have been holding water for close to 40 years. However, "bad" batches of silicone have been manufactured. O'Dell went out of business because of a bad batch that caused all...
Looks like TB Aquatics is going under. They're discounting everything, including all of the usual non-discounted MSRP brands. Discounts are only on in-stock merchandise. The current discount is around 10%, but it looks like the discounts will ramp up over time...
There are used food grade 55G plastic drums available. They were typically used for soda syrup, and bulk food ingredients. In the past I've gotten them from Corrado's wine & beer making supplies in Clifton.
corrado's wine grapes - Google Search
I've paid as little as $20 in the past, but...