BB gobies would be eaten by a mudskipper.
But I agree that you have two extremes that wouldn't suit both "types" of turtles well. Aquatic turtles would need almost the entire tank to swim, not a few gallons. Land turtles also wouldn't fare well with that much water. Either dedicate it to one, or the other.
If you go the aquatic route, you'd be needing about maybe 10 percent land area, or a simple place for them to get out and bask. Daily water changes would be best, or 50-100% per week. Make sure you have the correct lighting, and feed the right diet, supplements, etc.- aquatics are notorious for "shell curl", etc. otherwise.
HTH
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If you put "u" instead of typing out the actual, shocking, three letter word... i'm not going to read your ramblings.
I'm so behind it's not even funny.
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