Sounds like my moving water bog. The sarrs and VFT's, pings and drosera, thrive in this environment. There are basic differences in how ours work, but the idea is the same. To prevent algae growth in your holding tank, paint the outside of the tank with an elastomeric coating to cut off light, and cover the top to prevent any light getting in to the water. No light, no algae. The water flow is a very necessary one for CP health. The tray method works, but a flowing bog goes nuts!