I have a 20 Gal Tall dirted tank. I have a small bio load of 1 adult and 9 juv guppies. I have been dosing with potassium Nitrate, postasium phosphate, and SeaChem fluorish for micros. I generally add 0.3 g potassium nitrate and .1 g phosphate twice a week( I do not have the spoons). I do think I need to increase the amount of nitrate I add or the frequency because my API test shows low nitrate on the days I re-dose. This is a low tech tank with medium light.
Would snails eat a perfectly round hole like that?
I will try increasing the ferts and see what happens.