hello im new to this forum and require help i have 4 plecs (unsure what type) and 8 tetras i feed my fish once a day as told by the pet shop , i feed the aglae biscuit things to my plecs i put about 4 in and flakes for my tetras , i cant keep my water clean and the gravel is full of waste from the plecs its driving me potty , so i am gathering i need to reduce the feeds , i wnat to know how often i should be feeding them , they are large plecs about 12-14 inches in size , thankyou in advance xx 
