So I added TSS to my 33 and waited a week. i tested the water and it was: ammonia1 nitrite 0 nitrate 9 ph about 6.5 then i waited 3 more days and the ammonia was .25 all the other tests were the same. should i wait until the ammonia reaches 0 or should I do a 25% water change? if i should do a water change should I vacuum the gravel or just remove water? THANKS!!!