I've got these planted in my 225-gallon recently cycled tank with 4 dojo loaches and 7 small fancy goldfish. The goldfish did tear them up for a few days until I started supplementing boiled lettuce. Now they largely leave the foxtail alone and I can see a lot of new growth. I tried planting them in sand with root tabs to start, but saw a lot of die off within a few days (this could have been shock from transplanting.) I decided to replant in glass planter cups with Fluval Stratum and could see root growth coming out the bottom after just a couple of days. Now, three or four weeks later, they have roughly doubled in height. They are a bit patchy in places, but that is probably the goldfish's fault.