Yes, 16 fish is a lot and needs more than 3 cubes a day. Maybe feed them the three cubes about 3 times a day, but that still will be too little if they are the normal size cubes.
Some solid food, pellets or flakes, will hold them over more. Fish get Ich either from having it and then being introduced to your system, due to a temperature spike (water getting very cold for some reason), or other stressful event.
Your corals probably died because of a phosphate buildup from the overfeeding. That can happen because of the type of food also, some raise phosphate very easily. I use these pellets and flakes currently.
Ocean Nutrition™ Formula Flake Foods™ are innovative solutions that are the very best in fish nutrition. Formulated and extensively tested by aquaculture biologists, they are the most complete and nutritious foods available to the hobby. Ocean Nutrition Flakes include ingredients such as...
www.bulkreefsupply.com
Ocean Nutrition™ Formula Flake Foods™ are innovative solutions that are the very best in fish nutrition. Formulated and extensively tested by aquaculture biologists, they are the most complete and nutritious foods available to the hobby. Ocean Nutrition Flakes include ingredients such as...
www.bulkreefsupply.com
Bulk Reef Supply - Saltwater Aquarium Supplies for Reef Tanks
www.bulkreefsupply.com
Provide the Best Nutrition for Your Fish 1.2mm Slow Sinking Pellets Cold-Processed to Maintain Nutritional Value High in Fat & Protein Available in Several Pellet Sizes After researching fish feed manufacturing, Sustainable Aquatics learned that most fish feeds are processed at temperatures...
www.bulkreefsupply.com
PE Mysis is easily the most popular frozen food, and now they are producing PE Mysis in a flake form that is perfect for saltwater fish of all sizes. Flakes come in big chunks that you can break down to an appropriate size for your particular fish. Flake food is known for being very soft and...
www.bulkreefsupply.com
I really like the Sustainable Aquatics pellets and the all of those foods. They are excellent.