How much is more mud and how much salt do you have? Unless it was really cost prohibitive, I would dump everything, rinse it with freshwater, and start over by mixing the water for for a few days, then add new Mud to the fuge and follow the steps Eco Systems tank cycling guidelines.
You can use all of the dead crap in the tank as a bacteria source for cycling. You would want to try bringing in some good bacteria to the system at this point by adding LR
and substrate for the bacteria to spread in to. If you get a lot of LR
, you would not need substrate right away.
Also, you should do yourself a huge favor by picking up some books on saltwater aquariums and start reading those. Saltwater tanks are not to be taken lightly. Innocent mistakes can cost you hundreds of dollars of livestock or ruin a tank that took over a year to setup. Luckily for you, you are getting the mistakes out of the way early
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