I have two guppies in a 2.5 gallon tank. My son wanted some tank mates so I listened to Pet Supermarket & bought 4. The first one died the 1st day & I took it out. I haven't seen the other 3 all week & believe they are dead but can't find them. My Ammonia was 1.0 before the shrimp it is now 2.0. Nitrite is .25 & Nitrate is 0 . I did a 25% water change yesterday & retested Ammonia still 2.0. I have the API Master Test Kit. Should I take everything out of the tank to find the dead shrimp or wait it out? I know 2.5 gallons is small & will upgrade to a 29 gallon soon. I already bought the 29 gallon, just waiting on the stand.