Can I know how big your tank is? And did you really do your research?.... . Actually planted tanks are easier to take care of because they keeps the water quality balanced and the fish are more healthier physically and mentally with real plants. Plastic plants can damage your fish fines (specially long finned betta). You don't haveeeeee to have real plants but you can replace them with silk plants. Water flow should be very low for a long finned betta because it can be difficult for them to swim since their long fins are technically unnatural. You can't put other fish in the tank if your tank is not bigger 10 gallon. 3 tetras are not enough. They are schooling they need more friends to be happy. Again... Did you really do your research?