yep...it will be well worth the extra money to save your fishdo yourself a favor and purchase a decent kit that tests for ph ammonia nitrates and nitrites. you may spend 40 bucks but you will have a way better idea of what your water quality is really like. Ditch those crappy test strips and chalk it up as a loss.Test weekly, and keep a log. Your fish-keeping skills will grow(and your fish will thank you)