The liquid ones tend to be more accurate, plus I really don't like sticking stuff in my tank that has chemicals on it.
You really want to shoot for 1.5-2Lbs of rock per gallon. If you are buying all LR
(you can save some money and mix 75% base rock with 25% LR
) I would suggest you add all the LR
, drop in a pinch of food and wait 3-4 days and test for ammonia. If you see no ammonia, the LR
has enough beneficial bacteria on/in it to convert ammonia to nitrAtes. If this is the case, you can go ahead and add a tiny clean up crew (not much for them to eat in a newer tank) and a fish.
If you see ammonia, you will need to cycle the tank.
It's hard to tell if the limpet will make it or not.