Yes do your PWC & syphon it out, cut your feeds down to two or three times a week, although improving flow will not solve your water nutrient issues it will make it more aesthetically pleasing and good flow makes for a healthy tank. Reduce light for a few days if you want but again - not solving the problem, just not making it visible in your tank. Once a day feeding in not necessary, mine get M,W&F feeds. They are all fat and happy and very healthy!