Sorry, I meant to say don't go for a RBTA WITHOUT the MH lighting...they need intense light, I have 2 tanks ane in one they are under 2-175 watt MH's and 2- 110 watt VHO's. and even then they moved to the top half of the tank to be near the light and flow. The only RBTA that stays near the bottom is in my other tank and is under 2-400 watt MH's and 4-65 watt PC's.