I'm for sure on a no for two clowns, I'm not really comfortable putting 1 in actually.
I use a 20g aqua clear on my 10g, highly recommend it. Great media
Saltwater means a lot more then fake plants an such really as you can use fake plants but for the fishes health, I find its best to have some live rock for them to graze on.
I scrape the alage off daily and water changes with ro
To make saltwater, you first need an ro
filter, thus hooks up to an outside water faucet or a sink. Then you can buy premaid salt mix such as reef crystals.
When I had a clown, he took flakes easily and hermits should scavenge any missed flakes
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