my sea world acro is starting to rtn and i have a quarentine tank set up to treat red bugs. it is a twenty gallon tall i have a 250w 14 k bulb in a reflector sitting on some 2x4's with a max jet 1200 for flow.i have one tablet of interceptor for large dogs (22-45kg) how much do i use and what is the best way to treat as in how much water to change and when.