Welcome to TPT
As far as substrate if you plan on moving plants a lot don't go with dirt it will get messy for you, been there done that lol. If you like to rescape things I'd suggest going with something like eco complete or something similar. Now if you want to use dirt you can get miracle grow organic choice potting mix at home Depot for about 5 dollars or so. I'd get two bags for that tank and then you can put your sand/fluval stuff on top for the cap. It's up to you the possibilities are endless.
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As far as substrate if you plan on moving plants a lot don't go with dirt it will get messy for you, been there done that lol. If you like to rescape things I'd suggest going with something like eco complete or something similar. Now if you want to use dirt you can get miracle grow organic choice potting mix at home Depot for about 5 dollars or so. I'd get two bags for that tank and then you can put your sand/fluval stuff on top for the cap. It's up to you the possibilities are endless.
Sent from my LG-E980 using Tapatalk