The problem with LMB's is that they have too fast a metabolism to supplement their diet with foods other than natural algae. I had one that I managed to keep very healthy for about 6 months. I then had to cut back the feeding because my hair algae started to grow rampantly. I used both formula one and two frozen foods. He took to them both very readily, and was the first in the tank to get there. Try those out, but bear in mind that this is only a temporary fix. I know that there are those who successfully keep these fish in small tanks, but I would apply the same "rules" to these fish as mandarins and other pod eaters . . . . a big tank with lots of LR is a must.