Finally, for decoration, I got a fake, dark coloured sea fan, so that even when algae grew on it, it would not be very visible. I do no cleaning of any of my tank and the shrimp manage to keep the algae under control. I only feed once per week, using ShrimpKing shrimp food and fresh veg such as kale, cauliflower and broccoli. My shrimp are great eaters and swarm any food I put in there.