Don't afraid  , I'm using SM250 for 100g with SPS. Probably you have to add microelements like Grotech ABC+M, (I’m dosing 4 ml ABC+M every day)
Recommended depht is 20-25 cm.
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http://www.youtube.com/watch?v=Uuwjopsh2ZQ
120G, Laguna 6000, Deltec PF501, BK250, ATI6x80W, AM AT-Control, Tunze 2x6095+7096+Wavebox 6212, Teco TR10, TEC IIING, ...45LR+36LS
Current Tank Info: 100g, BK250 SM, PF501, Teco TR10, NY4500, Tunze Wavebox + 2x 6105, AM PH Computer and ...
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