Just so you know, generally you want 2 lbs. of LR for every gallon of water in your system, so you should try to add more. Also, reef systems so better with a specific gravity between 1.025-1.026. When adding fish (especially in smaller systems) it's important to only add one fish at a time. Adding fish will increase the bioload on your tank causing it to go through a mini-cycle. However, adding several fish at one time will cause a much bigger cycle which, can possibly kill fish, inverts, and corals.
With that being said, how did you know your cycle had finished? How often are you testing your water params? You said you do water changes 1-2 times per week, how much are you changing? And also, you said that you were using 2 marine live filters with wheel? do you clean the filter media out everytime you do your water changes? If not, you should eventually they will become nitrate factories and cause major issues in your tank.
