There isn't really a specific answer for that. Lots of people will say all you need is the proper amount of light and low, to let them do their thing and they'll spread. That works but feeding them can help them grow faster depending on how much of the mushroom's nutrition relies on stuff floating around in the water column. I would say that for mushrooms that clearly have tentacles (Ricordea yuma, florida and Rhodatis, some others) they will benifit the most from Zooplankton, up to some small meaty pieces of food (squid, mysis, etc.) and the regular smooth Discosomas probably just some phyto. Mushrooms also tend to thrive in tanks with a high nutrient content in the water and ime tanks where the owner never does a water change (maybe like once every two or three months). That's just my observations. HTH
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