Aternos support and compatibility questions

Hey guys! I am new here i read few posts about this and messages and there are still things i couldnt understand, 1. i have a world on aternos and i played on it for quite a while can i just change the server option from vanilla to fabric and then just add it and it will work on my ready made server? 2. will adding it to the server affect people who do not have DH installed playing on the server? like only load and use server resources when a DH player is on the server or will the game crash for them or the server wont work properly for them. 3. can DH run properly on aternos and are there any settings/ tweaks i can change that make it run better with aternos. thank you in advance i am not very experienced with this as i have been using DH on singleplayer for a while just not on servers
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