Its terrible that you have got such careless maintenance from that LFS,That is plain and simple bad business.You would think paying them $200 a month,plus stock,that they would do a better job.The owner not knowing that his own system was in that bad of shape?I would go with another company,and make sure they are reputable.as for the other place,I would not want store credit,I would demand my money back for all that was lost,and the $200 monthly fee,If they dont,sue them for negligent service.I cant imagine the thousands they have cost you over not doing the job right in the first place.As for the new company,naturally,they will try to sell you more stuff,so do some research on your own to see what equipment you already have will work on your system.You will not need half of what they will try to get you to upgrade to.Everything you stated will work fine,you will want a to look into changing your wet/dry into a refugium.Could be a simple fix,no need to get rid of it.The only thing you did wrong was to make a bad choice on that company.Dont take it to hard,Everyone makes mistakes,Its really sad how people prey on others new to saltwater.Hope you get it straightened out soon,Keep us posted