When i started off i tried to follow a fairly strict pattern but i found that i wasnt getting much growth, which i put down to overfeeding in the end! I was never letting the soil get completely dry and at one point i had like a moldy green pasty substance on the top of the soil (after research i THINK this was algae?)
So basically now i just try not to water it until the soil feels real dry at the top, put my finger in the soil to see if it still feels damp inside, and when it feels dry i water the bubbas! A couple times ive left it slightly too long and the leaves start drooping though but once watered they perk back up nicely
Id say it shouldve started around once a week or so when they were small (was more than this cause i overfed) and now im finding its getting a lot more often, maybe once every 3-4 days or so? Days are getting much warmer here though so thats probably a factor too
Yeah, that was algae, looks fine now though. How much nutrients are you feeding?