What substrate are you using? Fluval stratum? If so you need to look into either neo’s in caridina parameters or just straight caridina as that substrate is gonna buffer all your kh out to get the pH to drop below 6
Shrimp only tanks are quite easy to manage; only issue being they will not naturally take care of detritus worms and the likes like most fish will so being mindful of how much your feeding is very important. (Also good to remove extra food to keep parameters good, even with plants a tank this small can be tricky)
I had this exact tank when I first started, be aware that the light absolutely sucks! Condensation gathers under the lid like crazy and caused both my original and replacement light to burn out. Company is good about replacing parts tho thankfully!
Humble-Equipment2136 
What substrate are you using? Fluval stratum? If so you need to look into either neo’s in caridina parameters or just straight caridina as that substrate is gonna buffer all your kh out to get the pH to drop below 6
Shrimp only tanks are quite easy to manage; only issue being they will not naturally take care of detritus worms and the likes like most fish will so being mindful of how much your feeding is very important. (Also good to remove extra food to keep parameters good, even with plants a tank this small can be tricky)
I had this exact tank when I first started, be aware that the light absolutely sucks! Condensation gathers under the lid like crazy and caused both my original and replacement light to burn out. Company is good about replacing parts tho thankfully!