Slickfork - how long do you leave with hyposalinity? As for going fallow guess longer the better to ensure break the lifecycle of the ich.
Surgeonfish - figure go the route I'm thinking as have all the pieces around already and drilled a tank little while back for a 1" bulkhead and wasn't that bad (~20 minutes with a dremel). Don't have a canister nor a HOB filter big enough plus few years back QT'd some fish and amazed how quick the NH3 built up so figure the extra water volume would be a plus.
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