I was thinking the exact same thing the instant that pic opened I felt my blood presure go up... there is nothing good that is going to happen with that TSN in that tank with the RTC... there is to much of a size difference!!!
Yeah those cat's are looking good, good work. FYI, most people on here are going to say that the 300 won't be adequate for that RTC for life. Pond might be your best option. But since you're up here in the lower arctic circle, LOL, indoor pond may be the best solution if possible.