Amanda for your softy tank you really should go with LED's.you wont need that many bulbs to light the tank and the initial cost wont be as bad as you think.you could probably get away with 48 bulbs or so to light it and that would cost around $500 or maybe less depending on who you buy the bulbs/drivers from.my 24 bulb kit only cost me $280 shipped to my door and with the right lenght heatsink those 24 bulbs would light half your tank and only draw 72w max.im only able to run my 24 bulbs at half power since they are so bright and the tank is small.you should get two 24"x8.46" heatsinks,2 meanwell ELN 60-48D drivers,18 cool white crees,30 royal blues crees,4 fans,and 48/70 degree optics.this will give you plenty of light and run around $500.sell your current MH's and you wont have to spend more than $250 for the setup i listed above.if you want to know where i got my kit just pm me and ill send you all the info.
also you could save power with the pumps you use.im not sure what kind of return pump or flow pumps you have but you can most likely shave power by switching.i know the tunze return pump im getting only draws 40w max and puts out up to 900gph.obviously the pumps arent cheap up front but in time will pay for themselves in power savings.the new water blaster pumps also put out alot of water for being relatively low wattage and arent that expensive.what reurn pump do you run?do you have any internal flow pumps?if yes what kind?im a firm believer in paying for the best you can buy to save on power.my new 50g setup is going to draw less than 500w and it will be an sps system.im using a tunze return pump,2 vortec mp-10's for flow,i-tech 100 skimmer,2 eheim heaters,48 LED lights,one reactor,and a tunze osmolator.