Ammonia can be built up in them separately or the two together. Some species of fish produce more waste and therefore more ammonia than others, for example the goldfish. Turtles are also very wast producing and turtle tanks are often high in ammonia. All fish produce ammonia. So yes.
The turtles will eat the fish.
1) Vitamin A deficiency - add liver, green vegies & fish to your turtles' diet. 2) Ammonia burns - poor water maintenance can let the ammonia level build up. In this case you must change the water immediately and see the vet! With thanks to TJ Thornton's book: 'Keeping Red-eared Turtles in New Zealand
no turtles will eat any fish they can catch
It is highly unlikely. Most Turtles eat fish so it is also unwise to keep them together if you wish your fish to survive.
Yes, as long as it is large enough to accommodate the turtles. While a hatchling can live in a 10 gallon aquarium, it will soon need a 100 gallon aquarium as these turtles get up to 12" in shell length.
You have things the wrong way round. Aquatic turtles make the water toxic to fish. Fish have to try to breath by passing the foul water over their gills. Turtles breath air so the poisons (Ammonia and Nitrite) in the water will not do them any damage.
No, they will most likely eat your fish.
No. What happens in a fish tank is that ammonia is produced from the fish's waste (it is excreted through the gills, and their poo and uneaten food rapidly breaks down into ammonia). Plecos, by the way, are very messy fish. There is no way to prevent this from happening, and ammonia is extremely toxic to fish, even in tiny amounts. So the ammonia needs to be removed. The bacteria that change the ammonia into non toxic substances live in the filter, so without a filtration system the ammonia in the tank will build up and build up, killing the fish very fast. In order to sufficiently dilute the ammonia without a filter, you would have to do huge water changes several times a day, and in the sort of tank (100 gallons) required to support a fish as big as a plecostomus, this would be logistically impossible.
fish nets an boats do not drive boats were turtles are.
fish have gils turtles have scales fish have fins turtles have shells well you'll get it
tutles and fish should NEVER be kept together
Probably not the turtle will try to eat the fish